Add an event for populating field action menus

[mmikkel]

It'd be really neat if there was an event dispatched when Craft populates field action menus – i.e. to provide a way for plugin and modules to add custom field menu actions.

I can think of a lot of use cases for this – for example, an LLM-powered plugin providing actions for per-field content generation or translating.

Implementation wise, I assume a possible place for such an event could be in BaseField::formHtml(), where the event would be able to provide both the field layout element instance (i.e. the custom or native field; the event sender), the field's current actions (if any), and the element the field layout form is being rendered for.

[brandonkelly]

Good idea! Just added a EVENT_DEFINE_ACTION_MENU_ITEMS event to craft\base\Field for Craft 5.7. (943533e)

[mmikkel]

Awesome, thanks a lot @brandonkelly!