Add clippy to CI

[macladson]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.92%. Comparing base (03a0a64) to head (b3d60cd).

Files with missing lines	Patch %	Lines
src/fixed_vector.rs	0.00%	1 Missing ⚠️
src/variable_list.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #69   +/-   ##
=======================================
  Coverage   58.92%   58.92%           
=======================================
  Files           8        8           
  Lines         297      297           
=======================================
  Hits          175      175           
  Misses        122      122           

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[michaelsproul]

Looks good, but cargo fmt is failing due to an invalid flag

[macladson]

Whoops, I got a bit zealous with --all-features. Fixed now