Standalone configuration models for abiotic and abiotic simple models

[davidorme]

Description

This PR restructures the configuration of the abiotic and abiotic_simple models to provide a single standalone configuration for each model. The two models no longer need to supply both abiotic_constants and abiotic_simple_constants. This is important to make the models fully configurable - users need to be able to configure all settings for , for example, the abiotic model from within the [abiotic] configuration section.

It does this by:

• Creating a small shared constants configuration dataclass (AbioticSharedConstants) that contains only soil and leaf emissivity. These constants are required by both models.
• The AbioticConstants and AbioticSimpleConstants then build on that shared class to add model specific configuration. For the simple model, that is just initial_net_radiation - there was also a saturation_vapour_pressure_factors field but that was completely unused in the model code. For the full model, there are a lot of other constants.
• The Abiotic configuration now imports and includes the AbioticSimpleBounds as the [abiotic.bounds] configuration section. So, these bounds are defined in a single place but are now available directly from within a single model config.

The PR then updates the model code to remove all of the parallel usage of abiotic and abiotic_simple constants and just uses the single model configuration.

Closes #1137

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 94.33%. Comparing base (1a0ea4b) to head (910d3c5).
⚠️ Report is 6 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1139      +/-   ##
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- Coverage    94.33%   94.33%   -0.01%     
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  Files           70       70              
  Lines         7029     7024       -5     
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- Hits          6631     6626       -5     
  Misses         398      398              

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[vgro]

LGTM