Snow-Soil model

[kmdeck]

Purpose

As a precursor to integrating the snow model into the soil+canopy model, this integrates it with the soil model alone and runs it at a site.

To-do

Content

Creates a LandHydrology model with snow and soil, and runs this at the Ozark site for one year. Checks conservation

Review checklist

I have:

• followed the codebase contribution guide: https://clima.github.io/ClimateMachine.jl/latest/Contributing/
• followed the style guide: https://clima.github.io/ClimateMachine.jl/latest/DevDocs/CodeStyle/
• followed the documentation policy: https://github.com/CliMA/policies/wiki/Documentation-Policy
• checked that this PR does not duplicate an open PR.

In the Content, I have included

• relevant unit tests, and integration tests,
• appropriate docstrings on all functions, structs, and modules, and included relevant documentation.

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• [ ] I have read and checked the items on the review checklist.