Feature/animal module - The Madingley Foraging Update

[TaranRallings]

Description

This PR is to get the VE in line with the Madingley Model's approach to foraging dynamics. It is a lot more complicated than what I had done previously and now I understand why foraging took up most of their computing resources! Foraging is completely reworked and now involves a lot of hopping back and forth between methods of AnimalCohort and scaling_functions. I attempted to impose some consistent logic on which methods went where but I am confident it can be improved.

All feedback is welcome but I am particularly looking for errors/improvements to the organisational structure and how things are woven together. If you notice things that could speed up run-time, that would be useful as well.

This work is both too large and the product of new-dad brain, mea culpa. I am pretty sure some obvious stuff slipped through the cracks but I've been staring at this for too long to see it!

Fixes # (issue)

Type of change

• [x] 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

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

Further checks

• [x] Code is commented, particularly in hard-to-understand areas
• [x] Tests added that prove fix is effective or that feature works

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 97.79006% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 94.45%. Comparing base (803ed0f) to head (d606184).

Files	Patch %	Lines
virtual_ecosystem/models/animals/animal_cohorts.py	97.14%	3 Missing :warning:
...ual_ecosystem/models/animals/animal_communities.py	85.71%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #410 +/- ## =========================================== + Coverage 94.11% 94.45% +0.34% =========================================== Files 68 68 Lines 3434 3555 +121 =========================================== + Hits 3232 3358 +126 + Misses 202 197 -5 ```

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[TaranRallings]

LGTM too - there are three unresolved comments from my previous review. Could you resolve those?

Bah! I missed the "expand comments" bit they were hiding in!