chore(gRPC): Update a2a.proto to include metadata on GetTaskRequest

[a2a-bot]

Commit: a2aproject/A2A@f0d48cd

[gemini-code-assist]

Summary of Changes

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This pull request updates the A2A service specification, primarily by introducing a new metadata field to the GetTaskRequest message. This enhancement allows clients to send additional, unstructured data when requesting task information. The changes are reflected in the regenerated Python protobuf and type stub files, ensuring that the client-side code aligns with the updated API definition.

Highlights

• Enhanced GetTaskRequest with Metadata: The GetTaskRequest message now includes an optional metadata field. This field is of type google.protobuf.Struct, allowing for flexible, unstructured key-value data to be associated with task retrieval requests.
• Automated Protobuf Code Regeneration: The Python protobuf and type stub files (a2a_pb2.py and a2a_pb2.pyi) have been automatically regenerated to reflect the latest specification changes, ensuring API consistency.

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Code Review

This pull request updates generated gRPC files to add a metadata field to the GetTaskRequest message, based on a specification update.

However, the PR is critically incomplete as it only contains the generated files. The application logic that consumes GetTaskRequest has not been updated to handle the new metadata field. This includes GrpcHandler.GetTask in src/a2a/server/request_handlers/grpc_handler.py and its related tests in tests/server/request_handlers/test_grpc_handler.py.

Please update the relevant application and test code to fully implement and validate this change. Without these updates, the new field has no effect and the code is out of sync with its data definitions.