getExtension method 
    
    
    
  Implementation
  Pointer<void> getExtension(TUIExtensionType extensionType) {
  if (extensionType == TUIExtensionType.liveListManager) {
    return getLiveListManager();
  } else if (extensionType == TUIExtensionType.deviceManager) {
    return getMediaDeviceManager();
  } else if (extensionType == TUIExtensionType.conferenceListManager) {
    return getConferenceListManager();
  } else if (extensionType == TUIExtensionType.liveLayoutManager) {
    return getLiveLayoutManager();
  } else if (extensionType == TUIExtensionType.liveGiftManager) {
    return getLiveGiftManager();
  }
  return nullptr;
}