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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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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  dependency-type: direct:development
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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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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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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
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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
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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
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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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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)

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- dependency-name: dompurify
  dependency-type: direct:development
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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.

The real VitalSource viewer loads the final URL with a form submission,
which does not update the `src` attribute of the iframe. Make the demo
page also load the app in a way that doesn't modify the parent frame's
DOM, to ensure the client is not relying on that.

I don't know if these scenarios can actually happen in the real VS viewer, but
this feels like appropriate defensive coding.