Add support for CosmosDB triggers in Functions

[captainsafia]

Description

Adds support for CosmosDB-based triggers to Azure Functions. Tested with the following:

• Entra ID-based CosmosDB connection
• Access key-based CosmosDB connection

Ran into issues testing with classic emulator on Windows but putting this out in the meanwhile. Marked CosmosDB as an unstable emulator since it's long startup times seem to be timing out the E2E tests locally.

The preview emulator doesn't yet support the change feed feature that the CosmosDB trigger takes a dependency on.

Contributes to #7087

Checklist

• Is this feature complete?
  • Yes. Ready to ship.
  • No. Follow-up changes expected.
• Are you including unit tests for the changes and scenario tests if relevant?
  • Yes
  • No
• Did you add public API?
  • Yes
    • If yes, did you have an API Review for it?
      • Yes
      • No
    • Did you add <remarks /> and <code /> elements on your triple slash comments?
      • Yes
      • No
  • No
• Does the change make any security assumptions or guarantees?
  • Yes
    • If yes, have you done a threat model and had a security review?
      • Yes
      • No
  • No
• Does the change require an update in our Aspire docs?
  • Yes
    • Is this introducing a breaking change?
      • Yes
        • Link to aspire-docs issue (please use this breaking-change template):
      • No
        • Link to aspire-docs issue (please use this doc-idea template):
  • No

[davidfowl]

What are the follow up changes?

[davidfowl]

LGTM

[captainsafia]

What are the follow up changes?

• Figure out what the deal is with the classic emulator. I have a suspicion that the issues I ran into are more so related some Functions issues in VS preview than the actual emulator.
• Figure out when change feed support will be added to the preview emulator and validate the E2E with it then.

[davidfowl]

OK no code changes per se but experience problems with the emulator.

[captainsafia]

OK no code changes per se but experience problems with the emulator.

Yep -- I don't expect there to be any code changes.

[eerhardt]

Are there tests we can write for this functionality?

[captainsafia]

Are there tests we can write for this functionality?

Yes, we can build on the AzureFunctionsTest that we include in the project-specific tests. The tests are super flaky for me locally so I wanted to include this without introducing issues into the CI build.