Feature: surface repo ROSS index out to individual repos

[jpmcb]

Type of feature

🍕 Feature

Current behavior

We currently aren't surfacing the ROSS index within individual repos, like when doing v2/repos/search:

curl -X 'GET' \
  'https://api.opensauced.pizza/v2/repos/search?page=1&limit=10&range=30&prev_days_start_date=0&repo=kubernetes%2Fkubernetes' \
  -H 'accept: application/json'

{
  "data": [
    {
      "id": 20580498,
      // .. redacted

      "full_name": "kubernetes/kubernetes",
      // ... redacted

      "pr_active_count": 159,
      "open_prs_count": 140,
      "merged_prs_count": 339,
      "spam_prs_count": 0,
      "draft_prs_count": 19,
      "closed_prs_count": 125,
      "pr_velocity_count": 25,
      "activity_ratio": 10,
      "health": 10
    }
  ],
  "meta": {
    "page": 1,
    "limit": 10,
    "itemCount": 1,
    "pageCount": 1,
    "hasPreviousPage": false,
    "hasNextPage": false
  }
}

only the activity ratio and pr stats.

Suggested solution

We should surface the ROSS index for individual repos - followup to https://github.com/open-sauced/api/pull/587

Additional context

No response

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