Merging PR for worker indexing (project stein)

[surgupta-msft]

Document - Here

Epic - #7496

PR - #7606

The PR merge needs below steps to be completed -

1. PR review
2. Completion of below items that should go with first release of feature.
   - Worker Indexing - Move common validation logic into Utility #7806
   - Worker Indexing - Making IFunctionMetadataProvider.GetFunctionMetadata() an async method #7797
   - Update RpcFunctionMetadata with more properties azure-functions-language-worker-protobuf#57

[fabiocav]

@surgupta-msft working on breaking this down into more granular issues.

[surgupta-msft]

Tracking this issues as part of #7496

[surgupta-msft]

The PR has been merged - #7606