Instead of handling passing of Angular services to components directly
in `wrapReactComponent`, instead make the Angular `$injector` service,
from which references to all other services can be obtained, available
to the component tree via a `ServiceContext` provider.

Child components can then get references to services either using the
`withServices` wrapper, which looks up services and passes them as
props, or by using `useContext(ServiceContext)` to get a reference to
the injector directly.