minor #37223 [FrameworkBundle] Move identity translator configuration to PHP (smmd)

This PR was merged into the 5.2-dev branch.

Discussion
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[FrameworkBundle] Move identity translator configuration to PHP

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | symfony/symfony#37186
| License       | MIT

Move identity translator file to php

Commits
-------

335c9dba71 [FrameworkBundle] Move identity translator configuration to PHP

Author: fabpot

DependencyInjection/FrameworkExtension.php

@@ -213,7 +213,7 @@ public function load(array $configs, ContainerBuilder $container)
             }
 
             if (class_exists(Translator::class)) {
-                $loader->load('identity_translator.xml');
+                $phpLoader->load('identity_translator.php');
             }
         }
 

Resources/config/identity_translator.php

@@ -0,0 +1,25 @@
+<?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\DependencyInjection\Loader\Configurator;
+
+use Symfony\Component\Translation\IdentityTranslator;
+use Symfony\Contracts\Translation\TranslatorInterface;
+
+return static function (ContainerConfigurator $container) {
+    $container->services()
+        ->set('translator', IdentityTranslator::class)
+            ->public()
+        ->alias(TranslatorInterface::class, 'translator')
+
+        ->set('identity_translator', IdentityTranslator::class)
+    ;
+};