Mark constructors touched by Valinor as "used"

[Ocramius]

Context

Given following code:

<?php

final readonly class MyDTO {
    public function __construct(public string $foo) {}
}

return (new MapperBuilder())
  ->build()
  ->map(MyDTO::class, $_POST);

In this example, MyDTO::__construct() is marked as unused by vimeo/psalm and similar static analysis tooling.

It would be nice if the Valinor Psalm plugin marked such code location as used.

/cc @CristinCebotari