code: private function createHelperPluginManager(ContainerInterface $container): HelperPluginManager
      {
          $factory = new ViewHelperManagerFactory();
          /** @var HelperPluginManager $helperManager */
          $helperManager = $factory($container, ViewHelperManagerFactory::PLUGIN_MANAGER_CLASS);
          $config = new Config($this->getSpecificConfig($container, 'view_helpers'));
          $config->configureServiceManager($helperManager);
          return $helperManager;
      }
docs: Creates a view helper manager
  @param ContainerInterface|InteropContainer $container
  @return HelperPluginManager
  @throws ContainerException
  @throws NotFoundException