gRPC Client Metrics and Protobuf testing for client #878
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The metrics
duration
,bytes_in
,bytes_out
anderrors
are recorded. I also added tests for the gRPC client, since there were none previously.In terms of documentation, I will add it when #788 is merged (or it can add it itself)
question I have: The proto/client for the test case were mainly taken from the gRPC repo, which license should be used at the top? (grpc or OT?)