Feature: Lottery Factor chart for multiple repositories

[isabensusan]

Suggested solution

Context

Our current Lottery Factor chart provides really good insight into who's contributing to a specific project, but it's limited to showing contribution data for only one repository.

The problem is that projects are usually made up of different repositories, where there might or might not be contributor overlap, so being able to see this information across an organization could give some interesting insights.

Proposal

Create a Lottery Factor chart to be surfaced in repository insights and shows Lottery Factor across many different repositories.

This would show active contributors for all the repositories in the repository insight, with information on the amount of commits made by each contributor, and the % of the total that they represent. We'd also show the repositories within the repository insight where they have made those commits.

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[jpmcb]

FYI, for a subset of repos, the v2/repos/lotto endpoint already supports multiple repos. Example:

curl -X 'GET' \
  'https://api.opensauced.pizza/v2/repos/lotto?repos=pgvector%2Fpgvector%2Cqdrant%2Fqdrant&range=30&prev_days_start_date=0' \
  -H 'accept: application/json'

This gets the lotto factor for both pgvector and qdrant combined:

{
  "all_contribs": [
    {
      "contributor": "coszio",
      "count": 29,
      "percent_of_total": 0.22137404580152673,
      "lotto_factor": "moderate"
    },

    // etc. etc.

    {
      "contributor": "MarchLiu",
      "count": 1,
      "percent_of_total": 0.007633587786259542,
      "lotto_factor": "low"
    }
  ],
  "all_lotto_factor": "moderate",
  "grace_period_end": "2020-06-29T21:37:01.000Z"
}