searchLocalMessages method
Implementation
Future<Map<dynamic, dynamic>> searchLocalMessages(
    String conversationID, dynamic conversationType, dynamic config) async {
  final result = await promiseToFuture(ZIM.getInstance()!.searchLocalMessages(
          conversationID, conversationType, _mapToJSObject(config)))
      .catchError(_handleError);
  return _jsObjectToMap(result);
}