toggleMic method
Implementation
Future<void> toggleMic() async {
_isMicEnabled = !_isMicEnabled;
await _engine?.muteLocalAudioStream(!_isMicEnabled);
final local = _participants[_localUid];
if (local != null) {
_participants[_localUid] = local.copyWith(isMuted: !_isMicEnabled);
}
notifyListeners();
}