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David LiWes McKinney
4634c89fc77
David Li authored and Wes McKinney committed 7204e686720
ARROW-7477: [Java][FlightRPC] set up gRPC reflection metadata

This sets up the gRPC/Protobuf reflection metadata, so that [gRPC reflection](https://github.com/grpc/grpc/blob/master/doc/server-reflection.md) works. This is useful for debugging. Additionally, it means interceptors can do generic introspection on gRPC and Flight methods, without having to special-case them. (You might want to do this to implement path-based access control, for instance.)

Closes #6114 from lidavidm/arrow-7477-reflection and squashes the following commits:

8b763ddf9 <David Li> ARROW-7477:  set up gRPC reflection metadata

Authored-by: David Li <li.davidm96@gmail.com>
Signed-off-by: Wes McKinney <wesm+git@apache.org>