Change how the guest notifies other frames, specifically the sidebar and host,
when it is unloaded. The host and sidebar now receive a `frameDestroyed` message
from the corresponding guest port, which allows them to easily close the right
port and remove it from the list of active guest ports.

Due to a Safari bug (see code comments) we can't send the `frameDestroyed`
messages from the guest frame while it is being unloaded. However it is possible
to first transfer the port to the host frame and then have the host frame send
the message on the same port. I also tried sending the message from the guest
frame, and then transferring the port to the host frame but that didn't work.
This workaround has the advantage that it is transparent to the receiver of the
`frameDestroyed` message.

This change is also a step towards possibly not relying on user-provided guest
frame identifiers in the sidebar, which only become available once the
`documentInfoChanged` call has been received. Instead the sidebar could
use its own internal IDs for guest frames, avoiding the possibility for
conflicts.

Changes in detail:

 - Add `disconnect` method to PortRPC

 - When guest is unloaded, transfer ports to the host frame in a
   `hypothesisGuestUnloaded` message, and make the host frame dispatch
   `frameDestroyed` calls on these ports.

 - Handle `frameDestroyed` in sidebar by closing port, removing it from
   the active guest list and removing the associated frame from the
   store

 - Handle `frameDestroyed` in host frame by closing port and removing it
   from the active guest list

Unless the actual name is really verbose or conflicts with another variable, we prefer to avoid import aliases.

Made some very minor changes to avoid import aliases.

This is the convention that I followed to export objects in the
`src/sidebar/store/modules`:  name of the file plus the word `Module`. For example, `direct-linked.js` exports `directLinkedModule`.

The unused type referred to a class that has been deleted.

Co-authored-by: Robert Knight <robertknight@gmail.com>

The functionality to compute the buckets has been split in two steps:

1. Guest frame computes and sends a list of the anchors's top/bottom
   positions with the `anchorsChanged` RPC event.

2. In the host frame, `BucketBar` uses the list anchor's positions to
   compute the buckets.

There is one issue with the current approach: if an iframe doesn't cover
the entire host frame's viewport buckets can appear offset.

Bumps [aws-sdk](https://github.com/aws/aws-sdk-js) from 2.1062.0 to 2.1066.0.
- [Release notes](https://github.com/aws/aws-sdk-js/releases)
- [Changelog](https://github.com/aws/aws-sdk-js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/aws/aws-sdk-js/compare/v2.1062.0...v2.1066.0)

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updated-dependencies:
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  dependency-type: direct:development
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Bumps [@sentry/cli](https://github.com/getsentry/sentry-cli) from 1.72.0 to 1.72.1.
- [Release notes](https://github.com/getsentry/sentry-cli/releases)
- [Changelog](https://github.com/getsentry/sentry-cli/blob/master/CHANGELOG.md)
- [Commits](https://github.com/getsentry/sentry-cli/compare/1.72.0...1.72.1)

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updated-dependencies:
- dependency-name: "@sentry/cli"
  dependency-type: direct:development
  update-type: version-update:semver-patch
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Bumps [sinon](https://github.com/sinonjs/sinon) from 12.0.1 to 13.0.0.
- [Release notes](https://github.com/sinonjs/sinon/releases)
- [Changelog](https://github.com/sinonjs/sinon/blob/master/docs/changelog.md)
- [Commits](https://github.com/sinonjs/sinon/compare/v12.0.1...v13.0.0)

---
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- dependency-name: sinon
  dependency-type: direct:development
  update-type: version-update:semver-major
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Bumps [rollup](https://github.com/rollup/rollup) from 2.66.0 to 2.66.1.
- [Release notes](https://github.com/rollup/rollup/releases)
- [Changelog](https://github.com/rollup/rollup/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rollup/rollup/compare/v2.66.0...v2.66.1)

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- dependency-name: rollup
  dependency-type: direct:development
  update-type: version-update:semver-patch
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Bumps [karma](https://github.com/karma-runner/karma) from 6.3.11 to 6.3.12.
- [Release notes](https://github.com/karma-runner/karma/releases)
- [Changelog](https://github.com/karma-runner/karma/blob/master/CHANGELOG.md)
- [Commits](https://github.com/karma-runner/karma/compare/v6.3.11...v6.3.12)

---
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- dependency-name: karma
  dependency-type: direct:development
  update-type: version-update:semver-patch
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Bumps [commander](https://github.com/tj/commander.js) from 8.3.0 to 9.0.0.
- [Release notes](https://github.com/tj/commander.js/releases)
- [Changelog](https://github.com/tj/commander.js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/tj/commander.js/compare/v8.3.0...v9.0.0)

---
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- dependency-name: commander
  dependency-type: direct:development
  update-type: version-update:semver-major
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Bumps [preact](https://github.com/preactjs/preact) from 10.6.4 to 10.6.5.
- [Release notes](https://github.com/preactjs/preact/releases)
- [Commits](https://github.com/preactjs/preact/compare/10.6.4...10.6.5)

---
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- dependency-name: preact
  dependency-type: direct:development
  update-type: version-update:semver-patch
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Rename the module to match the `src/shared/messaging` directory name.
We've considered moving the integration test under
`src/shared/messaging/test` but have punted on that for now.

Make it easier for future developers to understand the inter-frame communication
code by grouping it in a directory with a short README and an index module that
defines the API for use by other parts of the client.

Bumps [tailwindcss](https://github.com/tailwindlabs/tailwindcss) from 3.0.15 to 3.0.18.
- [Release notes](https://github.com/tailwindlabs/tailwindcss/releases)
- [Changelog](https://github.com/tailwindlabs/tailwindcss/blob/master/CHANGELOG.md)
- [Commits](https://github.com/tailwindlabs/tailwindcss/compare/v3.0.15...v3.0.18)

---
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- dependency-name: tailwindcss
  dependency-type: direct:development
  update-type: version-update:semver-patch
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Bumps [@sentry/browser](https://github.com/getsentry/sentry-javascript) from 6.17.0 to 6.17.3.
- [Release notes](https://github.com/getsentry/sentry-javascript/releases)
- [Changelog](https://github.com/getsentry/sentry-javascript/blob/master/CHANGELOG.md)
- [Commits](https://github.com/getsentry/sentry-javascript/compare/6.17.0...6.17.3)

---
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- dependency-name: "@sentry/browser"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...
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Bumps [puppeteer](https://github.com/puppeteer/puppeteer) from 13.1.1 to 13.1.3.
- [Release notes](https://github.com/puppeteer/puppeteer/releases)
- [Changelog](https://github.com/puppeteer/puppeteer/blob/main/CHANGELOG.md)
- [Commits](https://github.com/puppeteer/puppeteer/compare/v13.1.1...v13.1.3)

---
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- dependency-name: puppeteer
  dependency-type: direct:development
  update-type: version-update:semver-patch
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Bumps [chai](https://github.com/chaijs/chai) from 4.3.4 to 4.3.6.
- [Release notes](https://github.com/chaijs/chai/releases)
- [Changelog](https://github.com/chaijs/chai/blob/4.x.x/History.md)
- [Commits](https://github.com/chaijs/chai/compare/v4.3.4...v4.3.6)

---
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- dependency-name: chai
  dependency-type: direct:development
  update-type: version-update:semver-patch
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Bumps [eslint](https://github.com/eslint/eslint) from 8.7.0 to 8.8.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/main/CHANGELOG.md)
- [Commits](https://github.com/eslint/eslint/compare/v8.7.0...v8.8.0)

---
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- dependency-name: eslint
  dependency-type: direct:development
  update-type: version-update:semver-minor
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Bumps [dompurify](https://github.com/cure53/DOMPurify) from 2.3.4 to 2.3.5.
- [Release notes](https://github.com/cure53/DOMPurify/releases)
- [Commits](https://github.com/cure53/DOMPurify/compare/2.3.4...2.3.5)

---
updated-dependencies:
- dependency-name: dompurify
  dependency-type: direct:development
  update-type: version-update:semver-patch
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Replace use of local utility classes with tailwind
utility classes that do the same thing. Structure the utilities
layer for both sidebar and annotator.

Clarify what happens if we try to test whether a VitalSource frame
contains "real content", before it has finished loading.