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/ChillMainBundle/Pagination/ChillItemsPerPageTwig.php

@@ -0,0 +1,67 @@
+<?php
+
+/*
+ * Chill is a software for social workers
+ *
+ * Copyright (C) 2021, Champs Libres Cooperative SCRLFS,
+ * <http://www.champs-libres.coop>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+namespace Chill\MainBundle\Pagination;
+
+use Twig\Environment;
+use Twig\Extension\AbstractExtension;
+use Twig\TwigFunction;
+
+/**
+ * add twig function to render pagination
+ *
+ * @author Mathieu Jaumotte <mathieu.jaumotte@champs-libres.coop>
+ * @author Champs Libres <info@champs-libres.coop>
+ */
+class ChillItemsPerPageTwig extends AbstractExtension
+{
+    public function getName()
+    {
+        return 'chill_items_per_page';
+    }
+
+    public function getFunctions()
+    {
+        return array(
+           new TwigFunction(
+                 'chill_items_per_page',
+                 array($this, 'paginationRender'),
+                 array(
+                    'needs_environment' => true,
+                    'is_safe' => ['html']
+                 )
+            )
+        );
+    }
+
+    public function paginationRender(
+          Environment $env,
+          PaginatorInterface $paginator,
+          $template = '@ChillMain/Pagination/items_per_page.html.twig'
+    ) {
+
+        return $env->render($template, array(
+           'paginator' => $paginator,
+           'current' => $paginator->getItemsPerPage()
+        ));
+    }
+}