feat(odsp-client): Add OdspContainerServices readonly and sensitivity label event emitters

[znewton]

Description

Portion of #25597 to add read-only state and sensitivity labels events to OdspContainerServices.

Reviewer Guidance

I think this PR could be better if it separated read-only events and sensitivity label events, but it will introduce either merge conflicts or blocking on either. I think it would be weird to extend IEventProvider without any events, which would allow for async feature introduction.

[github-actions]

🔗 Found some broken links! 💔

Run a link check locally to find them. See
https://github.com/microsoft/FluidFramework/wiki/Checking-for-broken-links-in-the-documentation for more information.

linkcheck output

> [email protected] ci:check-links /home/runner/work/FluidFramework/FluidFramework/docs
> start-server-and-test "npm run serve -- --no-open" 3000 check-links

1: starting server using command "npm run serve -- --no-open"
and when url "[ 'http://127.0.0.1:3000' ]" is responding with HTTP status code 200
running tests using command "npm run check-links"


> [email protected] serve
> docusaurus serve --no-open

[SUCCESS] Serving "build" directory at: http://localhost:3000/

> [email protected] check-links
> linkcheck http://localhost:3000 --skip-file skipped-urls.txt

 ELIFECYCLE  Command failed with exit code 1.