Service Catalogue - Create a screen in the private profile to enable users management

A screen where the SS or SP will be able to manage all the users created in the organisation including:
- Possibility to create subgroups in the organisation (like the municipalities inside an aggregator).
- The name of users.
- Their user role.
- The sub-organisation they belong to.
- Available services.
- Possibility to change the privileges of the users.
