adding twig extensions to select how many items per page

* twig anchor: {{ chill_items_per_page(pagination) }}
* select field changed with javascript event listener

src/Bundle/ChillThirdPartyBundle/Controller/ThirdPartyController.php

@@ -70,8 +70,6 @@ class ThirdPartyController extends Controller
         $nbThirdParties = $repository->countByMemberOfCenters($centers);
         $pagination = $this->paginatorFactory->create($nbThirdParties);
         
-        $pagination->setItemsPerPage(20);
-        
         $thirdParties = $repository->findByMemberOfCenters(
             $centers,
             $pagination->getCurrentPage()->getFirstItemNumber(),