build: Add code coverage and badge

[stanleyjones]

Closes #122.

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[stanleyjones]

Just doing the same thing as https://github.com/liftedinit/gwen/pull/65 but for Alberto.

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (main@0c8a9d5). Click here to learn what that means. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #126   +/-   ##
=======================================
  Coverage        ?   34.33%           
=======================================
  Files           ?       88           
  Lines           ?     2234           
  Branches        ?      648           
=======================================
  Hits            ?      767           
  Misses          ?     1456           
  Partials        ?       11           

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