Enable ClassLikes to properly detect implementing class aliases

[boesing]

Fixes #6325

[boesing]

Early on, I was thinking if it would be a thing to have class_alias interfaces as part of class_implements as well. So that the map wont just contain the FQCN but also the alias.

So in my example I've created in the unit test:

$classStorage = new ClassLikeStorage('Baz');
$classStorage->class_implements = [
    'bar' => 'Bar',
    'foo' => 'Foo',
];

But this would somehow require psalm to detect class_alias and then iterating over all classes it already infered (and cached) and adding additional details based on all detected class_alias. Not sure if this would be doable and thus, I've added the detection to the ClassLikes logic instead.

[weirdan]

Thanks!