deleteAllMetaData method
Deletes all meta data.
Implementation
Future<void> deleteAllMetaData() async {
  sbLog.i(StackTrace.current);
  checkUnsupportedAction();
  final ts = await chat.apiClient.send<int>(
    ChannelMetaDataDeleteAllRequest(
      chat,
      channelType: channelType,
      channelUrl: channelUrl,
    ),
  );
  final cachedMetaData =
      chat.channelCache.find<MetaDataCache>(channelKey: channelUrl) ??
          MetaDataCache<String>(
            channelType: channelType,
            channelUrl: channelUrl,
            timestamp: ts,
          );
  cachedMetaData.removeAll(ts);
  cachedMetaData.saveToCache(chat);
}