Add SoilFreezeThaw, SoilMoistureProfile, and LGARmodels

[aaraney]

Closes #25

ngen.config - 0.2.5

Additions

• Add SoilFreezeThaw, SoilMoistureProfile, and LGAR models

Removals

Changes

Notes

• (SoilFreezeThaw) Is it appropriate to set num_cells as the main_output_variable?
  See https://github.com/NOAA-OWP/SoilFreezeThaw/blob/14610e3f0c69cbfb62564b19b8f5762e7c6aef63/examples/realizations/realization_cfe.json#L130
• (SoilFreezeThaw) Is it appropriate to see as "ground_temperature" : "TGS" in variables_names_map?
  See https://github.com/NOAA-OWP/SoilFreezeThaw/blob/14610e3f0c69cbfb62564b19b8f5762e7c6aef63/examples/realizations/realization_cfe.json#L132
• Are there appropriate defaults for SoilMoistureProfile and LGAR?

TODOs

• Either in this PR or another, add the bmi init config's for these models.

Checklist

• PR has an informative and human-readable title
• Changes are limited to a single goal (no scope creep)
• Code can be automatically merged (no conflicts)
• Code follows project standards (link if applicable)
• Passes all existing automated tests
• Any change in functionality is tested
• New functions are documented (with a description, list of inputs, and expected output)
• Placeholder code is flagged / future todos are captured in comments
• Project documentation has been updated (including the "Unreleased" section of the CHANGELOG)
• Reviewers requested with the Reviewers tool ➡️

[aaraney]

close in favor of #97