Add Yujie's RT as an optional module

[AlexisRenchon]

Purpose

This PR is a start to add the RT canopy model developed by Yujie to ClimaLand.jl. NOTE: we might not need Yujie's model as a dependency, if we copy-paste the code we need

To-do

Tuesday 21, possibly meet with Dennis Zhaoyi? Discuss structure compatible with GPU

Content

step by step in Yujies: lines 43 to 48 https://github.com/CliMA/Land/blob/v0.1/src/CanopyLayers/initialize/all.jl#L43

TO DO:

• [ ] copy-paste the pieces of code that we need, we can simplify things such as parameters given instead of calculated

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