Add waste from herbivore mechanical inefficiencies to the litter

[jacobcook1995]

Description

This PR adds a new HebivoryWaste pool which stores things that herbivores take from plants which don't reach their digestive tracks. At the moment herbivory is only implemented for leaves, so this also only works for leaves, but this should be readily extensible to other plant matter types.

Type of change

• New feature (non-breaking change which adds functionality)
• Optimization (back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)

Key checklist

• Make sure you've run the pre-commit checks: $ pre-commit run -a
• All tests pass: $ poetry run pytest

Further checks

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works
• Relevant documentation reviewed and updated

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.15%. Comparing base (8097392) to head (5d1ee7c).
⚠️ Report is 3270 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #577      +/-   ##
===========================================
+ Coverage    95.04%   95.15%   +0.10%     
===========================================
  Files           74       74              
  Lines         4262     4295      +33     
===========================================
+ Hits          4051     4087      +36     
+ Misses         211      208       -3     

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[TaranRallings]

This LGTM. We're going to have to rework it basically immediately anyway lol.