N°6934 - Symfony 6.4 - upgrade Symfony bundles to 6.4 (#580)

* Update Symfony lib to version ~6.4.0
* Update code missing return type
* Add an iTop general configuration entry to store application secret (Symfony mandatory parameter)
* Use dependency injection in ExceptionListener & UserProvider classes

lib/symfony/var-exporter/LazyObjectInterface.php

@@ -0,0 +1,32 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\VarExporter;
+
+interface LazyObjectInterface
+{
+    /**
+     * Returns whether the object is initialized.
+     *
+     * @param $partial Whether partially initialized objects should be considered as initialized
+     */
+    public function isLazyObjectInitialized(bool $partial = false): bool;
+
+    /**
+     * Forces initialization of a lazy object and returns it.
+     */
+    public function initializeLazyObject(): object;
+
+    /**
+     * @return bool Returns false when the object cannot be reset, ie when it's not a lazy object
+     */
+    public function resetLazyObject(): bool;
+}