Add CodeCov CI coverage requirements

[ntindle]

Background

This helps ensure the quality of the code stays high. https://docs.codecov.com/docs/commit-status

Changes

Adds a coverage.yml file in the format specified by code cov

Documentation

Test Plan

This is the test

PR Quality Checklist

• My pull request is atomic and focuses on a single change.
• I have thoroughly tested my changes with multiple different prompts.
• I have considered potential risks and mitigations for my changes.
• I have documented my changes clearly and comprehensively.
• I have not snuck in any "extra" small tweaks changes

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (fc4b5ad) 36.29% compared to head (e4bbb33) 36.29%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2881   +/-   ##
=======================================
  Coverage   36.29%   36.29%           
=======================================
  Files          60       60           
  Lines        2849     2849           
  Branches      471      471           
=======================================
  Hits         1034     1034           
  Misses       1753     1753           
  Partials       62       62           

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[Pwuts]

Looks reasonable enough to me :)