Offer the mention types as a list in the Edit Macro dialog of the mention macro

The type of the mention macro is a free text field of the Edit Macro dialog with a single value in XWiki Standard, user, which extensions can add to.

The main problem:

• A wiki macro cannot declare the list, and the types come from extensions, so a provider with the installed types is needed.

Depends on

Most of these fields cannot be offered before these generic changes, each giving the macro the means to declare the expected value:

• XWIKI-23045, which lets a parameter get its values from a provider, with or without custom values.

KOs covered

Impact found on macro fluidity

These 1 KOs come from the WYSIWYG usability audit of the macros, under the criterion C4 input-assistance of its usability criteria. The page of each macro, linked in the table, has the full notes and the steps to reproduce. Fixing them means changing the declaration of the parameters in the macro definitions.