Launchpad MP (501314) - r00ta/openfga-users-to-groups-endpoints

[r00tabot]

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Commit message: feat: add v2 and v3 API usergroup membership endpoints

Details:

• openfga built-in migrations are executed before the alembic migrations, because we added an alembic migration that creates a view on the openfga.tuple table.
• A new view maasserver_usergroup_members_view has been added. It reads data from the openfga.tuple table and joins it with the auth_user table, so to return the list of users and their groups.
• V2 endpoints to list, add and remove users to groups
• V3 endpoints to list, add and remove users to groups
• Avoid adding system users to groups.