Add grid feature

I am adding a patch for the beta4 version that does not require PHP 8.3

Hi mlo,

Thanks for the report & proposed solution.
We will review when we get the chance.

Just by a first look, I can tell that we're missing the update hook, so marking this as needs work.
On the other hand, in the linked documentation there's a note for the use with looped slides, maybe it would be good to have it in Drupal as well.
And last but not least, I tried just to enable the grid and my images were at height 0, couldn't see anything. Is there other setting that could conflict this? I was using the most recent default values (I also rebased your branch). We had work on fixing the schema.