Use google.golang.org/protobuf instead of github.com/gogo/protobuf
This change replaces github.com/gogo/protobuf with google.golang.org/protobuf, except for the code generators. All proto-encoded structs are now generated from .proto files, which include ttrpc.Request and ttrpc.Response. Signed-off-by: Kazuyoshi Kato <katokazu@amazon.com>
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