This adds an operator that splits all slots of the action on the active object,
into separate actions.
The newly created actions will be named `slot_name+Action`.
All users of those slots will be reassigned to this new action.
The exploded action will not be deleted, but will end up with 0 users
unless a fake user is set.
------
For the review, does that operator name make sense?
Pull Request: https://projects.blender.org/blender/blender/pulls/128251
85e4bd19f6