Support of PHP8 Attributes

Hey,

I tried to refactor an application to use Doctrine ORM Attributes, however this leads to an error in TsVectorSubscriber.php line 178 as no Column Annotation can be found anymore (its an Attibute now).

Unfortunatly, it requires some workarounds to support attributes and annotations at the same time in the same doctrine mapping space. So it is not nice to need to keep all entities in the same mapping space with "old" annotations. I suggest to first use the Reflection APIs ::getAttributes() in TsVectorSubscriber.php line 178 and if this fails use the Doctrine/AnnotationReader only.

For concistency I suggest to also move the Annotations of this package to support Attributes too (No BC break should be needed). Here is how Doctrine supports both on the same class:

use Attribute;
use Doctrine\Common\Annotations\Annotation\NamedArgumentConstructor;

/**
 * @Annotation
 * @NamedArgumentConstructor()
 * @Target({"PROPERTY","ANNOTATION"})
 */
#[Attribute(Attribute::TARGET_PROPERTY)]
final class Column implements Annotation
{ ...

The Doctrine ORM package achieves continued compatibility with PHP <8.0 by using symfony/polyfill-php80, so I would recommend the same.

I only have too few usages, but one could potentially create a rector rule for the migration as well. If its wanted I am willing to try and create a PR in the next days.

jaimz22 / DoctrineFullTextPostrgres

Support of PHP8 Attributes #27