Investigate better handling of h2 goaway for grpc stream handlers

[eaddingtonwhite]

Currently for topics we are handling h2 goaway in a grpc stream by handling grpc unavailable error that's returned by go grpc in this scenario. This is not ideal though ideally this should be handled at a lower level so could do something like this in golang would be more robust:

	if e, ok := err.(http2.GoAwayError); ok {
		if e.ErrCode == http2.ErrCodeNo {
			fmt.Println(fmt.Sprintf("got goaway error %+v", e))
		}
	}