✨(backend) add user abilities for front

This allows, on a per user basis, the display of
features.

The main goal here is to allow Team admin or owner
to see the management views.
We also added the same for the two other features
(mailboxes and contacts)

This will be improved later if needed :)

src/backend/core/api/viewsets.py

@@ -188,6 +188,7 @@ class UserViewSet(
     permission_classes = [permissions.IsSelf]
     queryset = models.User.objects.all().order_by("-created_at")
     serializer_class = serializers.UserSerializer
+    get_me_serializer_class = serializers.UserMeSerializer
     throttle_classes = [BurstRateThrottle, SustainedRateThrottle]
     pagination_class = Pagination
 
@@ -225,9 +226,7 @@ class UserViewSet(
         Return information on currently logged user
         """
         user = request.user
-        return response.Response(
-            self.serializer_class(user, context={"request": request}).data
-        )
+        return response.Response(self.get_serializer(user).data)
 
 
 class TeamViewSet(