Expose rating counts grouped by star in API

[kumar303]

The API (maybe add-on detail API?) needs to expose rating counts grouped by stars. It could look something like this (just an idea):

{
  "slug": "some-addon",
  "ratings": {
    "count": 1913,
    "count_per_star": {
      "5": 1478,
      "4": 237,
      "3": 95,
      "2": 41,
      "1": 62,
    }
  }
}

Here is how we will be rendering it in the UI:

[diox]

The reviews API already has a show_grouped_ratings parameter for this : http://addons-server.readthedocs.io/en/latest/topics/api/reviews.html

Is that enough for you ? It's not ideal for perf to have this in the add-on detail API.

[kumar303]

Oh! I somehow totally forgot about that one. Thanks, I'll try it with that and see if I run into any issues.