[DX] Add PHP linter before passing code to Rector

[TomasVotruba]

Fixes https://getrector.org/demo/1e80fa45-ce57-497d-babc-a01a08ed62dd

Inspire at PHP CS Fixer https://github.com/FriendsOfPHP/PHP-CS-Fixer/blob/3e5dd53a0ab1fbe87057b06a027d8d072457ca3e/src/Linter/Linter.php