Refactor SoilCO2ModelParameters constructor

[nefrathenrici]

This PR uses ClimaParams for SoilCO2ModelParameters.

As before, the new constructors are:

import ClimaLand
import ClimaParams as CP
toml_dict= CP.create_toml_dict(Float32)

ClimaLand.Soil.Biogeochemistry.SoilCO2ModelParameters(Float64)
ClimaLand.Soil.Biogeochemistry.SoilCO2ModelParameters(Float64; ν = 99999)
ClimaLand.Soil.Biogeochemistry.SoilCO2ModelParameters(toml_dict)
ClimaLand.Soil.Biogeochemistry.SoilCO2ModelParameters(toml_dict; ν = 99999)

[AlexisRenchon]

Our soilCO2 model is a combination of these two papers:
https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1365-2486.2011.02546.x
for the co2 production model
and https://gmd.copernicus.org/articles/11/1909/2018/ for the diffusion model
they provide example of values for the parameters, we could pick any for the default... note that they are not in SI and need to be converted.
Happy to help more!

[nefrathenrici]

Thank you @AlexisRenchon !

[AlexisRenchon]

Hi Nat,
The PR looks good... is there anything in particular I should look at?

[nefrathenrici]

Hi Nat, The PR looks good... is there anything in particular I should look at?

Are these defaults correct?

[AlexisRenchon]

Yes the defaults are correct!
Maybe for porosity we could just say 0.5, if we do need a default (porosity of the soil is going to be different everywhere so it's a bit weird to have a very specific default)