added custom link formatter

[JulianDroog]

Added functionality for using custom link formatters

Example:

[
 'url' => ['action' => 'view', 'extra' => ("/' + obj.id + '")],
 'label' => '<i class="fa fa-long-arrow-alt-up mx-1" onclick="modalView(obj.id)" data-bs-toggle="modal" data-modal type="modal-xl" ></i>',
 'type' => \CakeDC\Datatables\Datatables::LINK_TYPE_CUSTOM,
 'formatter' => CustomFormatter::class,
],

[steinkel]

missing ! as we need to throw exception if the link method does not exist

[JulianDroog]

Copied it wrong, my bad