Feature: Devstats - Identify repeat contributors to repo who are not on core team

[jpmcb]

We want to identify the contributors to a project / repo who are "outside" the core team (aka, the people who merge pull requests):

In order to identify these individuals, we want to inspect:

• pull_request_github_events: Used to identify people making code contributions
• push_github_events: Those who push to a main branch on a repo are the "core" team since they are the ones doing the merging. In the future, we may want a better mechanism / user input field to identify who these people are.

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Related to: https://github.com/open-sauced/engineering/issues/37

Maybe related to: https://github.com/open-sauced/api/issues/625