Integrate Kover for code coverage reporting

[twyatt]

"Replaces" JaCoCo with Kover. Although Kover can use JaCoCo under-the-hood, it is much simpler to configure than JaCoCo, and in newer versions of Kotlin, JaCoCo will become much more difficult to setup directly (since java plugin is no longer allowed to be used) — this will unblock #323.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.52%. Comparing base (56a59f1) to head (79389a3).
Report is 250 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #325      +/-   ##
============================================
+ Coverage     57.25%   58.52%   +1.26%     
============================================
  Files             8        8              
  Lines           613      639      +26     
  Branches        145      145              
============================================
+ Hits            351      374      +23     
- Misses          223      228       +5     
+ Partials         39       37       -2     

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[cedrickcooke]

❤️