Provide more options to drive the display of the UI style form

This module connect paragraphs module and UI styles module, properties definition of style belongs to the UI style module, hence moving ticket.
There is already a related ticket ✨ UX: Add other widgets than select Active

Add the possibility to make the selection of a value required

This doesn't look like a good idea. It is hard to picture a required style utility in a design system. Always required? For every renderables?

Alter the default "-None-" option to another label (for example, for a plugin around "Borders", "No border" makes more sense from a contributor standpoint).

Why not... Maybe a new property like this one from Form API:

#empty_option: (optional) The label to show for the first default option. By default, the label is automatically set to "- Select -" for a required field and "- None -" for an optional field.

I add this proposal to ✨ UX: Add other widgets than select Active and I close this issue. Thanks a lot for the proposal Vincent.

Select the default value

Default value is always none/empty.