setup coverage

[jyooru]

This PR configures codecov to track coverage for this project.

It has been configured so that:

• coverage uploads are tagged with matrix variables, os and python-version
• if coverage goes below 50%, codecov will add a fail status to a PR (this was what was previously set in noxfile.py)
• the following is ignored:
  • noxfile.py
  • code in a if __name__ == "__main__" block
  • lines/blocks commented with # pragma: no cover - examples

Feel free to change anything, and let me know if you want any configuration changes.

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (main@d0b0e17). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #191   +/-   ##
=======================================
  Coverage        ?   92.06%           
=======================================
  Files           ?       13           
  Lines           ?     1600           
  Branches        ?        0           
=======================================
  Hits            ?     1473           
  Misses          ?      127           
  Partials        ?        0           

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[bee-san]

This is very cool, thanks! :)