Allow supervisors to see CHW targets and support display of aggregate targets widgets

[ngaruko]

Refer to https://github.com/medic/cht-core/issues/4839

1. In app-settings, add "aggregate": true to target like:

   
         "id": "active-pregnancies",
         "type": "count",
         "goal": 6,
         "aggregate": true,
         "translation_key": "targets.anc.active_pregnancies.title",
         "icon": "icon-pregnancy",
         "subtitle_translation_key": "targets.all_time.subtitle"
       } ```

2. create a supervisor with a number of chw under
3. log in as the supervisor. should see the figures on aggregates tab

4. submit some reports under different users/chw and check for accuracy in aggregates

   Consider : . have some targets that are should be aggregated and some that shouldn't. .have every type of target: percent with goal, percent without goal, count with goal, count without goal . have a supervisee that hasn't added "created" their target doc

[ngaruko]

Automated