AC-1740: Add rectorphp as a dependency to magento-coding-standard and run it as part of the GitHub actions

Author: eliseacornejo

composer.json

@@ -13,7 +13,8 @@
         "ext-simplexml": "*",
         "ext-dom": "*",
         "phpcompatibility/php-compatibility": "^9.3",
-        "squizlabs/php_codesniffer": "^3.6"
+        "squizlabs/php_codesniffer": "^3.6",
+        "rector/rector": "^0.12.4"
     },
     "require-dev": {
         "phpunit/phpunit": "^9.5.8"