Increase test coverage of PbjProtocolHandler

[rbair23]

Tasks

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1. Add support for testing metrics #326
   +0
2. Verify correct behavior if the content type is incorrect
3. Verify content type of "application/grpc" becomes "application/grpc+proto"
4. Verify only the "identity" grpc-encoding is supported
5. Verify the "timeout" works
6. Verify missing the "timeout" results in no timeout
7. Verify "application/grpc+json" and "application/grpc" and "application/grpc+proto" create the correct "options"
8. Verify if "authority" is sent, it is passed to the options
9. Verify a GrpcException in the service interface's "open" method is handled
10. Verify an HttpException is not thrown by the "open" method
11. Verify unknown exceptions thrown from the "open" method are handled correctly
12. Verify the behavior if the client resets the stream before data is sent
13. Verify the behavior if the client resets the stream after some data is sent but not all
14. Verify the behavior if the client resets the stream after all data is sent
15. Verify the behavior of data handling with a fuzz test for what bytes are sent on each call
16. Verify the behavior of data handling if not all bytes needed are sent per call
17. Verify the result if an unexpected error occurs while handling data bytes
18. Verify behavior of data handling when all bytes have been sent and then an EOS is sent with no new bytes
19. Verify the "deadlineFuture" is never left in limbo. It is always canceled in success or failure
20. Verify the stream state is closed when the request/response is done (and that this is the right thing to do)
21. Verify every response frame contains the correct stream ID