Feature - Feeding Animals into Data

[TaranRallings]

Description

These changes introduce some animal data to be tracked by the central Data system. The point, at this stage, is not to be tracking important science but to have some basic tracking infrastructure in place to add to later and for demos of the VE system. Included here is tracking for population densities and for respiration products.

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

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.50%. Comparing base (8a5dcdf) to head (570462c). Report is 3 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #415 +/- ## =========================================== + Coverage 94.45% 94.50% +0.04% =========================================== Files 68 68 Lines 3555 3583 +28 =========================================== + Hits 3358 3386 +28 Misses 197 197 ```

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