Refactored code to use PHP8 attributes instead of annotations

In this change, Doctrine and validation annotations have been replaced with PHP8 Attributes. The Rector tool has been configured with a list of annotations to convert to attributes. As a consequence, the PHPStan's rules have been updated to reflect these changes. The PHP8's nullable operator (?) has been added where required, and comments in field declaration have been replaced with #[Attribute] syntax.

src/Bundle/ChillPersonBundle/Entity/Household/Household.php

@@ -25,12 +25,10 @@ use Symfony\Component\Serializer\Annotation as Serializer;
 use Symfony\Component\Validator\Constraints as Assert;
 use Symfony\Component\Validator\Context\ExecutionContextInterface;
 
-/**
- * @MaxHolder(groups={"household_memberships"})
- */
 #[Serializer\DiscriminatorMap(typeProperty: 'type', mapping: ['household' => Household::class])]
 #[ORM\Entity]
 #[ORM\Table(name: 'chill_person_household')]
+#[MaxHolder(groups: ['household_memberships'])]
 class Household
 {
     /**