Add support for PHP 8.1 Backed Enums in Select, Checkboxes, Radio elements

@duadua do you have any narrative to add or is your MR pure experimentation?

I'd suggest creating a personal patch issue if its the latter, for example 📌 [ignore] @dpi's patch testing issue Active

@dpi
That's a great recommendation. I'll do that and experiment a bit more first, before posting a MR into this issue.

@dpi

To be honest I am confused whether to create MRs against 10.1.x or 11.x at this point.

Left some comments on the MR

We have some failing custom commands here (likely linting)