Added production of fungal fruiting bodies

[jacobcook1995]

Description

This PR adds production of fruiting bodies by soil fungi. On the soil side this change is fairly straightforward, fungi allocate a certain proportion of their new biomass to fruiting body production in the same way that they allocate to enzyme production. The production rate across all fungal groups is then summed and passed to the animal model.

The animal model stores the mass of fruiting bodies as a scavengable pool. As well as scavenging the animal model also updates this pool based on the input of new fruiting body biomass from the soil model, and the decay of fruiting bodies. This decay gets passed back to the soil model as low molecular weight carbon (and the equivalent forms of nitrogen and phosphorus). At each time step the animal model also updates the fungal fruiting body abundance in the data object.

@TaranRallings, I've added a reasonable amount of code to the animal model here, so let me know if you are happy with the changes.

Fixes #932. Fixes #907

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

❌ Patch coverage is 96.26168% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.24%. Comparing base (7065537) to head (ec857f8).
⚠️ Report is 1554 commits behind head on develop.

Files with missing lines	Patch %	Lines
virtual_ecosystem/models/animal/decay.py	91.42%	3 Missing ⚠️
...ample_data/generation_scripts/soil_example_data.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #948      +/-   ##
===========================================
+ Coverage    94.21%   94.24%   +0.02%     
===========================================
  Files           79       79              
  Lines         6381     6477      +96     
===========================================
+ Hits          6012     6104      +92     
- Misses         369      373       +4     

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[dalonsoa]

It's a pretty long PR, but I think all makes sense and is clear. This is becoming more complicated by the minute...

[jacobcook1995]

This is becoming more complicated by the minute...

Yes this is the last addition that I intended to make to the soil model before moving onto bug-fixing and calibration, so this should be as most complex as the soil model gets 🤞

[TaranRallings]

The animal content looks good to me!