Promoted properties are losing nullable flag

[Grundik]

Bug Report

Q	A
Version(s)	4.7.1 (all versions affected since 4.5.0)

Summary

Laminas\Code\Generator\PromotedParameterGenerator#fromParameterGeneratorWithVisibility are losing nullable flag of such parameter.

Current behavior

class Test {
    public function __construct(
        protected ?int $value
    ) {
    }
}

$parameterReflection = new ParameterReflection([Test::class, '__construct'], 0);
$parameterGenerator = PromotedParameterGenerator::fromReflection($parameterReflection);
echo $parameterGenerator->generate();

will echo protected int $value, nullable flag is lost.

How to reproduce

Use snippet above.

Expected behavior

Code above should echo protected ?int $value.

Additional information

https://github.com/laminas/laminas-code/blob/169123b3ede20a9193480c53de2a8194f8c073ec/src/Generator/PromotedParameterGenerator.php#LL73C51-L73C51

    public static function fromParameterGeneratorWithVisibility(ParameterGenerator $generator, string $visibility): self
    {
        $name = $generator->getName();
        $type = $generator->getType(); // <----- this would return "bare" type, without modifiers

Unfortunately, there are no way to get nullable flag from TypeGenerator at all for now. Unsurprisingly it get lost on the way.

[Grundik]

Possible fix: #184