[Feature] Implement a new Route Name Checker that uses Sylius' Section Provider

[vvasiloi]

Example implementation:

<?php

declare(strict_types=1);

namespace App\Access\Checker;

use Odiseo\SyliusRbacPlugin\Access\Checker\RouteNameCheckerInterface;
use Sylius\Bundle\AdminBundle\SectionResolver\AdminSection;
use Sylius\Bundle\CoreBundle\SectionResolver\SectionProviderInterface;

final class RouteNameChecker implements RouteNameCheckerInterface
{
    private SectionProviderInterface $sectionProvider;

    public function __construct(SectionProviderInterface $sectionProvider)
    {
        $this->sectionProvider = $sectionProvider;
    }

    public function isAdminRoute(string $routeName): bool
    {
        return $this->sectionProvider->getSection() instanceof AdminSection;
    }
}

I can submit a PR if you're interested in the feature, otherwise just close it.