Persist table grouping in session

[gehrisandro]

It would be nice to have the ability to persist the selected table grouping (and direction) in the session, similar to persisting the sort in session.

@danharrin If you agree to this feature request, I will create a PR.

Thanks again to the Filament team for the amazing product! 🎉

[danharrin]

Hi, thanks for checking. I would accept a PR for v4, thank you