Set up Clippy on CI

[michaelsproul]

• Clippy on CI
• Fix currently outstanding Clippy lints

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.24%. Comparing base (3c54a52) to head (a0b51f6).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #30      +/-   ##
==========================================
+ Coverage   86.19%   86.24%   +0.04%     
==========================================
  Files           6        6              
  Lines         297      298       +1     
==========================================
+ Hits          256      257       +1     
  Misses         41       41              

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