feat: add @valinor-* annotations to override an unparseable type

[romm]

PHPStan and Psalm accept type syntaxes that this library cannot parse, for instance a conditional type like ($a is 1 ? int : null). Such a type ends up unresolvable, and the only way out was to remove or weaken the annotation, making the static analysis tools lose information the library was not able to use anyway.

The annotations @valinor-var, @valinor-param and @valinor-return can now declare a type that only this library reads. They take precedence over their @phpstan-*, @psalm-* and native counterparts, so both worlds can be served by the same docblock:

final class SomeClass
{
    /**
     * @phpstan-param ($a is 1 ? int : null) $b
     * @valinor-param int|null $b
     */
    public function __construct(
        public readonly int $a,
        public readonly ?int $b,
    ) {}
}

Finding the parameter name declared by a @param-like annotation now ignores the $variable tokens nested inside brackets, so a conditional type such as ($a is 1 ? int : string) $b is bound to $b and not to the $a appearing inside the type.

Fixes #448