Support for native return type missing from parent @return tag

The EventSubscriberInterface from Symfony has an `@return` annotation, and all classes that implement it and have no native return type get a deprecation error message.

```php
class Foo implements EventSubscriberInterface
{
public static function getSubscribedEvents()
{
}
}
```

```
Method "Symfony\Component\EventDiser\EventSubscriberInterface::getSubscribedEvents()" might add "array" as a native return type declaration in the future. Do the same in implementation "Foo" now to avoid errors or add an explicit @return annotation to suppress this message.
```

It would be nice if we could get the error in PHPStan instead of running the actual application :)

Description