What happened?

#996 introduced GetTaskRequest.metadata to gRPC which makes it in sync with the JSON RPC schema TaskQueryParams. However, GetTaskRequest is a GET in REST protocol, and given that metadata is a struct, it cannot be easily serialized or mapped to HTTP params.

This is causing multiple build failures in Google.

Relevant log output

http: map field 'google.protobuf.Struct.fields' referred to by message 'a2a.v1.GetTaskRequest' cannot be mapped as an HTTP parameter.

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