createData static method
Creates a DATA frame
Implementation
static YamuxFrame createData(int streamId, Uint8List data, {bool fin = false}) {
  return YamuxFrame(
    type: YamuxFrameType.dataFrame,
    flags: fin ? YamuxFlags.fin : 0,
    streamId: streamId,
    length: data.length,
    data: data,
  );
}