create method
Implementation
Future<List<String>?> create(List<T> objects) async {
List<Map<String, dynamic>?> mapObjects =
objects.map((object) => reflector.serialize(object)).toList();
return (await _channel.invokeMethod("Backendless.Data.of.create",
<String, dynamic>{'tableName': _tableName, 'objects': mapObjects}))
.cast<String>();
}