Support for code coverage

[levmckinney]

Adds support for code coverage to the package. Ideally this should enforce 100% coverage on tests and increasing coverage for all subsequent pull requests.

[norabelrose]

Is this like a ratcheting thing where it never lets the coverage go down in a new PR? I agree we need more coverage than we currently do although I remember codecov was sort of a pain in the ass when contributing to imitation

[levmckinney]

Is this like a ratcheting thing where it never lets the coverage go down in a new PR? I agree we need more coverage than we currently do although I remember codecov was sort of a pain in the ass when contributing to imitation

At the moment all it does is make sure that overall code coverage does not go down. I'm inclined to configure it to require X% code coverage for all new lines added by a pull requests. I'm thinking like 95%, so you don't have to worry about covering every error, but most paths are getting covered.

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (main@af55452). Click here to learn what that means. The diff coverage is n/a.

:exclamation: Current head 1c07299 differs from pull request most recent head 0816a2f. Consider uploading reports for the commit 0816a2f to get more accurate results

@@           Coverage Diff           @@
##             main      #40   +/-   ##
=======================================
  Coverage        ?   41.06%           
=======================================
  Files           ?       34           
  Lines           ?     2077           
  Branches        ?        0           
=======================================
  Hits            ?      853           
  Misses          ?     1224           
  Partials        ?        0           

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