[Epic] Add functionality in host to support function indexing by worker

[anandagopal6]

Host should accommodate for new worker indexing pipeline while remaining backwards compatible.

Steps

• Check for worker indexing capability and redirect to worker indexing pipeline when appropriate #7516
• Add GRPC message definitions for sending metadata requests and receiving metadata from worker #7513
• Add functionality into GrpcWorkerChannel to send and receive worker indexing message types #7514
• Break down channel initialization in RpcFunctionInvocationDispatcher #7550
• Process received metadata from worker and hydrate pipeline with metadata #7556
• Develop worker indexing unit tests #7582
• Documentation for adopting worker indexing flow in the host #7532
• Worker Indexing - Move common validation logic into Utility #7806
• Worker Indexing - Making IFunctionMetadataProvider.GetFunctionMetadata() an async method #7797
• Worker Indexing Changes #7606
• Worker Indexing - Prepare consolidated documentation with more details in Engineering hub #7850
• Worker Indexing - Protobuf changes to update RpcFunctionMetadata with more properties #7849
• Worker Indexing - Investigation on using worker capabilities instead of worker.config #7879
• Worker Indexing - Host to fall back on its indexing if worker denies by checking legacy payload #7916
• Validate disabled function logic for worker indexing #8081
• Project stein - Host not sending load request after fallback requested from worker #8199
• Worker Indexing - Adding log to inform about mixed function app #8110
• Additional logging - Project stein - Adding additional logs and exception handling #8231
• Detector - link

[surgupta-msft]

@fabiocav Does it make sense to close this Epic now as the tasks listed in the description are done?