setLocalCustomData method
Implementation
@override
Future<V2TimCallback> setLocalCustomData(
    {required String msgID, required String localCustomData}) async {
  final result = await TencentImSDKPlugin.v2TIMManager
      .getMessageManager()
      .setLocalCustomData(msgID: msgID, localCustomData: localCustomData);
  if (result.code != 0) {
    _coreService.callOnCallback(TIMCallback(
        type: TIMCallbackType.API_ERROR,
        errorMsg: result.desc,
        errorCode: result.code));
  }
  return result;
}