setForegroundMode method
Set foreground mode of the CallNotifService service (Android only)
Implementation
Future<void> setForegroundMode(bool enabled) async{
  if(Platform.isAndroid) {
    if(_foregroundModeEnabled==enabled) return;
    _logs?.print('set foreground mode - $enabled');
    try {
      await SiprixVoipSdk().setForegroundMode(enabled);
      _foregroundModeEnabled = enabled;
      notifyListeners();
    } on PlatformException catch (err) {
      _logs?.print('Can\'t setForegroundMode. Err: ${err.code} ${err.message}');
      return Future.error((err.message==null) ? err.code : err.message!);
    }
  }
}