Add Select to set the number of elements displayed on the index page

[AJIeksandro]

Short description of what this feature will allow to do:

1. Add a select to the index page, for example at the bottom and left of the list of items.
2. The select contains integers in ascending order.
3. Selecting a specific value allows you to display a specified number of items in list.

Example of how to use this feature

A. For all Entity Crud Controllers:

use EasyCorp\Bundle\EasyAdminBundle\Controller\AbstractDashboardController;

class DashboardController extends AbstractDashboardController
{
...
    public function configureCrud(): Crud
        {
            return Crud::new()
                ->setPaginatorPageSizes([5, 10, 20, 50, 100, 500, 1000]);
        }
}

B. For a particular Entity Crud Controller:

class TechnicalMeansCrudController extends AbstractCrudController
{
...
    public function configureCrud(Crud $crud): Crud
    {
        return $crud
                ->setPaginatorPageSizes([5, 10, 20, 50, 100, 500, 1000]);
    }
}```