CredEquate: create credequate CLI/API

[blueridger]

Description

builds on #3295

This adds the credequate API/CLI, which is the credequate equivalent of the credrank API/CLI. This CLI turns plugin contributions into scored contributions, creates a CredGrainView, writes the results, and outputs top cred earners to the console.

Test Plan

Manual tested against sourcecred/cred/gh-pages
Results pushed to https://github.com/sourcecred/cred/tree/credequate-demo

sourcecred.json

{
  "bundledPlugins": [
  ],
  "credEquatePlugins": [
    {
      "id": "sourcecred/discord",
      "configsByTarget": {
        "453243919774253079": [
          {
            "memo": "Initial Config",
            "startDate": "1/1/2021",
            "weights": [
              {
                "key": "emoji",
                "default": 1,
                "subkeys": [
                  {
                    "subkey": "sourcecred:626763367893303303",
                    "weight": 3
                  },
                  {
                    "subkey": "👎",
                    "weight": 0
                  }
                ]
              },
              {
                "key": "role",
                "default": 0,
                "subkeys": [
                  {
                    "subkey": "477551557723029514",
                    "memo": "contributors",
                    "weight": 2
                  },
                  {
                    "subkey": "717905734863421472",
                    "memo": "community",
                    "weight": 1
                  }
                ]
              },
              {
                "key": "channel",
                "default": 1,
                "subkeys": [
                  {
                    "subkey": "743545520445718700",
                    "memo": "meeting-notes",
                    "weight": 8
                  },
                  {
                    "subkey": "718512695875469353",
                    "memo": "announcements",
                    "weight": 0.1
                  },
                  {
                    "subkey": "454007860926611478",
                    "memo": "any-questions",
                    "weight": 3
                  },
                  {
                    "subkey": "679064720375808026",
                    "memo": "props",
                    "weight": 15
                  },
                  {
                    "subkey": "543168537062014987",
                    "memo": "did-a-thing",
                    "weight": 12
                  }
                ]
              },
              {
                "key": "category",
                "default": 1,
                "subkeys": []
              }
            ],
            "operators": [
              {
                "key": "reactionsAcrossParticipants",
                "operator": "AVERAGE"
              },
              {
                "key": "reactionsOfSingleParticipant",
                "operator": "MAX"
              }
            ],
            "shares": [
              {
                "key": "author",
                "default": 1,
                "subkeys": [
                  {
                    "subkey": "743545520445718700",
                    "memo": "meeting-notes",
                    "weight": 0.05
                  },
                  {
                    "subkey": "679064720375808026",
                    "memo": "props",
                    "weight": 0
                  }
                ]
              },
              {
                "key": "mention",
                "default": 1,
                "subkeys": []
              }
            ]
          }
        ]
      }
    }
  ]
}

1. run scdev contributions
2. run scdev credequate && scdev credequate --no-zip

console result:

  GO   credequate
# Top Participants By Cred

| Description | Cred | % |
| --- | --- | --- |
| Thena | 19363.9 | 13.6% |
| Ryeder | 13586.6 | 9.5% |
| s-ben | 10616.3 | 7.5% |
| KuraFire | 8045.8 | 5.7% |
| AL0YSI0US | 7426.7 | 5.2% |
| topocount | 6737.9 | 4.7% |
| hz | 6248.4 | 4.4% |
| ezrau | 5439.0 | 3.8% |
| lbstrobbe | 5426.2 | 3.8% |
| saintmedusa | 4315.1 | 3.0% |
| panchomiguel | 4166.2 | 2.9% |
| echojuliet | 4108.1 | 2.9% |
| hammad | 3767.0 | 2.6% |
| scrabbleboy | 3627.1 | 2.5% |
| magwalk | 3441.5 | 2.4% |
| joiecousins | 2338.0 | 1.6% |
| lotusleaf | 2074.3 | 1.5% |
| Magey | 1897.0 | 1.3% |
| Willow | 1875.4 | 1.3% |
| Marcie | 1843.4 | 1.3% |
  GO   writing changes
 DONE  writing changes: 1850ms
 DONE  credequate: 5009ms