Add Rector and use PHP 8 attributes

[IonBazan]

This PR adds Rector which helps with PHP and libraries/frameworks upgrades. Because the diff would be too large for manual review, I left executing the upgrade to the maintainer.

Changes include:

• Adding rector/rector dependency and upgrading phpstan/phpstan
• Adding Symfony 5.4 upgrade list - uses #[Route] and #[Assert\*] attributes instead of annotations
• Adding Doctrine ORM 2.9 list - uses PHP 8 attributes instead of annotations for entity mapping (a change is needed in config/packages/doctrine.yaml)
• Adding PHPUnit 9.x list - uses $this->createMock() where applicable
• Converting App\Validator\* constraints to PHP 8 attributes

Unfortunately, adding PHP 8 upgrade rules list causes Rector to crash on my machine so I didn't add it this time.

[private-packagist[bot]]

composer.lock

Dev Package changes

Package	Operation	From	To	Changes
rector/rector	add	-	0.13.9	view code
phpstan/phpstan	upgrade	1.7.2	1.8.2	diff

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[Seldaek]

Closing as https://github.com/composer/packagist/pull/1329 includes the commit here. Thanks for just sending the config and not doing all the changes :)