[data-grid] filter+sorter sequence support

[vvval]

emulates filter bc we have only addFilter or addSorter setters

class SortedFilter implements SequenceInterface, FilterInterface
{
    private string $value;

    /** @var SpecificationInterface[] */
    private array $specifications;

    public function __construct(string $value, SpecificationInterface ...$specifications)
    {
        $this->value = $value;
        $this->specifications = $specifications;
    }

    /**
     * @return SpecificationInterface[]
     */
    public function getSpecifications(): array
    {
        return $this->specifications;
    }

    public function getValue(): string
    {
        return $this->value;
    }

    public function withValue($value): ?SpecificationInterface
    {
        return $this;
    }
}

[vvval]

Usage:

$schema->addFilter(
    'filter',
    new Filter\Select(
        [
            'upcoming'      => new SortedFilter(
                'upcoming',
                new Filter\Gt('date', new DateTimeImmutable('now')),
                new AscSorter('date')
            ),
            'mostReviewed'  => new SortedFilter(
                'mostReviewed',
                new Filter\Lte('date', new DateTimeImmutable('now')),
                new DescSorter('count_reviews')
            )
        ]
    )
);