createGroup method
MARK: - Group
Implementation
Future<Map<dynamic, dynamic>> createGroup(
    dynamic groupInfo, dynamic userIDs, dynamic config) async {
  final result = await promiseToFuture(ZIM.getInstance()!.createGroup(
          _mapToJSObject(groupInfo), userIDs, _mapToJSObject(config)))
      .catchError(_handleError);
  return _jsObjectToMap(result);
}