Add entry point to support more PagerType

[VincentLanglet]

Feature Request

A PagerFactory could be provided by this library:

final PagerFactory implements PagerFactoryInterface
{
     public function create(string $pagerType): PagerInterface
     {
          switch ($pagerType) {
            case Pager::TYPE_DEFAULT:
                return new Pager();

            case Pager::TYPE_SIMPLE:
                /** @var SimplePager<ProxyQueryInterface<object>> $simplePager */
                $simplePager = new SimplePager();

                return $simplePager;

            default:
                throw new \RuntimeException(sprintf('Unknown pager type "%s".', $pagerType));
        }
    }
}

then we could change the following code
https://github.com/sonata-project/SonataDoctrineORMAdminBundle/blob/4.x/src/Builder/DatagridBuilder.php#L147
to

$pager = $this->pagerFactory->create($admin->getPagerType());

And people will be able to support new pagerType or override the page easily.

[github-actions]

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