add: composer

* add phpstan library and require extensions

composer.json

@@ -102,8 +102,12 @@
         }
     },
     "require-dev": {
+        "ext-dom": "*",
+        "ext-simplexml": "*",
+        "ext-xml": "*",
         "doctrine/doctrine-fixtures-bundle": "^4.0",
         "fakerphp/faker": "^1.24",
+        "phpstan/phpstan": "^2.1",
         "phpunit/phpunit": "^9.5",
         "symfony/browser-kit": "7.2.*",
         "symfony/css-selector": "7.2.*",