code: public function getConfigTreeBuilder()
      {
          $treeBuilder = new TreeBuilder('fxp_block');
          /* @var ArrayNodeDefinition $rootNode */
          $rootNode = $treeBuilder->getRootNode();
  
          $this->addBlockSection($rootNode);
          $this->addDoctrineSection($rootNode);
          $this->addProfilerSection($rootNode);
  
          return $treeBuilder;
      }
docs: {@inheritdoc}