Add support PHPStan value-of

[ryinner]

Feature description or problem with existing feature
https://phpstan.org/writing-php-code/phpdoc-types#key-and-value-types-of-arrays-and-iterables

Example of use: When we use old orms, we often don't have the ability to specify Enum as a data type without writing custom logic, but with value-of we can specify a specific range of values.

Example VSCode:

enum PublishedStates: int {
  case Draft = 0;
  case Published = 1;
  case Indexed = 2;
}

final class Post extends \OldOrm\BaseModel
{
  public ?int $id = null;
  /** @var value-of<PublishedStates> */
  public int $published;
}

$post = new Post();
$post->published = 0; // suggestion 0 | 1 | 2
$post->create();