code: public function getConfigTreeBuilder()
      {
          $builder = new TreeBuilder;
          $node = $builder->root('ds_entity');
          $node
              ->children()
                  ->booleanNode('uuidentifiable')
                      ->defaultFalse()
                  ->end()
                  ->booleanNode('custom_identifiable')
                      ->defaultFalse()
                  ->end()
              ->end();
  
          return $builder;
      }
docs: {@inheritdoc}