mute method
Implementation
Future<int> mute(bool value) async {
RCRTCLog.d(tag, "set mute $value");
int? code = await channel.invokeMethod("mute", value);
int ret = code ?? -1;
if (ret == 0) _mute = value;
RCRTCLog.d(tag, "after mute success is 0 : $ret}");
return ret;
}