Increase test coverage of PbjProtocolHandler

[rbair23]

### Tasks
- [ ] https://github.com/hashgraph/pbj/issues/326
- [x] Verify correct behavior if the content type is incorrect
- [x] Verify content type of "application/grpc" becomes "application/grpc+proto"
- [ ] Verify only the "identity" grpc-encoding is supported
- [ ] Verify the "timeout" works
- [ ] Verify missing the "timeout" results in no timeout
- [ ] Verify "application/grpc+json" and "application/grpc" and "application/grpc+proto" create the correct "options"
- [ ] Verify if "authority" is sent, it is passed to the options
- [ ] Verify a GrpcException in the service interface's "open" method is handled
- [ ] Verify an HttpException is not thrown by the "open" method
- [ ] Verify unknown exceptions thrown from the "open" method are handled correctly
- [ ] Verify the behavior if the client resets the stream *before* data is sent
- [ ] Verify the behavior if the client resets the stream *after some* data is sent but not all
- [ ] Verify the behavior if the client resets the stream *after* all data is sent
- [ ] Verify the behavior of data handling with a fuzz test for what bytes are sent on each call
- [ ] Verify the behavior of data handling if not all bytes needed are sent per call
- [ ] Verify the result if an unexpected error occurs while handling data bytes
- [ ] Verify behavior of data handling when all bytes have been sent and then an EOS is sent with no new bytes
- [ ] Verify the "deadlineFuture" is never left in limbo. It is always canceled in success or failure
- [ ] Verify the stream state is closed when the request/response is done (and that this is the right thing to do)
- [ ] Verify every response frame contains the correct stream ID