`ValueObjectTransformer::getPropertyValue()` return type is too strict.

[bendavies]

Hi,

Ref:
#139 (comment)

ValueObjectTransformer::getPropertyValue() return type is too strict.
Here is a form type and class which will generate an error because \DateTimeImmutable is returned.

[2024-10-26T16:42:11.209764+00:00] request.CRITICAL: Uncaught PHP Exception TypeError: "Qossmic\RichModelForms\DataTransformer\ValueObjectTransformer::getPropertyValue(): Return value must be of type string|int|bool|null, DateTimeImmutable returned" at ValueObjectTransformer.php line 107 {"exception":"[object] (TypeError(code: 0): Qossmic\\RichModelForms\\DataTransformer\\ValueObjectTransformer::getPropertyValue(): Return value must be of type string|int|bool|null, DateTimeImmutable returned at ...vendor/qossmic/rich-model-forms-bundle/src/Qossmic/DataTransformer/ValueObjectTransformer.php:107)

<?php

declare(strict_types=1);

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\Extension\Core\Type\ChoiceType;
use Symfony\Component\Form\Extension\Core\Type\DateType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;

class FooType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options): void
    {
        $builder->setMethod('GET');

        $builder->add('dateFrom', DateType::class, [
            'label' => 'From',
            'widget' => 'single_text',
            'required' => true,
            'input' => 'datetime_immutable',
        ]);
    }

    public function configureOptions(OptionsResolver $resolver): void
    {
        $resolver->setDefault('factory', [Foo::class, 'create']);
        $resolver->setDefault('immutable', true);
    }

    public function getBlockPrefix(): string
    {
        return 'foo';
    }
}

<?php

declare(strict_types=1);

namespace BindHQ\Bundle\WebAppBundle\Model;

use BindHQ\Assert\Assert;
use BindHQ\Bundle\TaxBundle\Interfaces\CollectedBy;

class Foo
{
    private function __construct(
        private \DateTimeImmutable $dateFrom,
    ) {
    }

    public static function create(\DateTimeImmutable $dateFrom): self
    {
        return new self($dateFrom);
    }


    public function getDateFrom(): \DateTimeImmutable
    {
        return $this->dateFrom;
    }
}