feat: show oyster contribution stats in admin dashboard 📊

[tomas-salgado]

Description ✏️

This PR implements a script that extracts information regarding the number of unique contributors to Oyster. Specifically, running this script will give the data on how many unique contributors have implemented a feature fix, bug fix, or other type of contribution.

Type of Change 🐞

• Feature - A non-breaking change which adds functionality.
• Fix - A non-breaking change which fixes an issue.
• Refactor - A change that neither fixes a bug nor adds a feature.
• Documentation - A change only to in-code or markdown documentation.
• Tests - A change that adds missing unit/integration tests.
• Chore - A change that is likely none of the above.

Checklist ✅

• I have done a self-review of my code.
• I have manually tested my code (if applicable).
• I have added/updated any relevant documentation (if applicable).

[ramiAbdou]

Yo, thinking through this a bit more, can we actually expose this in the Admin Dashboard so that it's easier to access at any point? Thinking we can just expose a modal at like /github/contributions that just displays some of this information. We can store the GitHub API token as an environment variable in the admin-dashboard app.

[ramiAbdou]

@tomas-salgado I ported your script (slightly simplified cause we just need stats right now) over to the Admin Dashboard, thank you for the legwork you did on this!