Feature/add radiation input

[vgro]

This PR adds top of canopy shortwave downward radiation to the dummy example data. I noticed that this is a required variable when I started testing ve_run with the mechanistic abiotic model. I also noticed that molar density of air and specific heat of air were calculated but not added to the data object, so I updated that. The model is still not running but I stopped here as priorities shifted towards completing the simple abiotic model.

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

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 58.82353% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 94.52%. Comparing base (5621b8d) to head (423134d).

Files	Patch %	Lines
...tion_scripts/topofcanopy_radiation_example_data.py	0.00%	7 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #423      +/-   ##
===========================================
- Coverage    94.69%   94.52%   -0.17%     
===========================================
  Files           69       70       +1     
  Lines         3732     3744      +12     
===========================================
+ Hits          3534     3539       +5     
- Misses         198      205       +7     

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[davidorme]

All looks good to me.