Remove derivative in favour of manual Debug impl

[macladson]

Fixes #36

Removes derivative in favour of a manual Debug impl since it's trivial to get the inner vec from inside the structs without any derivative features

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.84%. Comparing base (dd6ac18) to head (47a05b0).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #61      +/-   ##
==========================================
+ Coverage   58.62%   58.84%   +0.22%     
==========================================
  Files           8        8              
  Lines         290      294       +4     
==========================================
+ Hits          170      173       +3     
- Misses        120      121       +1     

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