[MIG] base_user_role: Migration to 12.0

base_user_role/readme/DESCRIPTION.rst

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+This module was written to extend the standard functionality regarding users
+and groups management.
+It helps creating well-defined user roles and associating them to users.
+
+It can become very hard to maintain a large number of user profiles over time,
+juggling with many technical groups. For this purpose, this module will help
+you to:
+
+  * define functional roles by aggregating low-level groups,
+  * set user accounts with the predefined roles (roles are cumulative),
+  * update groups of all relevant user accounts (all at once),
+  * ensure that user accounts will have the groups defined in their roles
+    (nothing more, nothing less). In other words, you can not set groups
+    manually on a user as long as there is roles configured on it,
+  * activate/deactivate roles depending on the date (useful to plan holidays, etc)
+  * get a quick overview of roles and the related user accounts.
+
+That way you make clear the different responsabilities within a company, and
+are able to add and update user accounts in a scalable and reliable way.