Add support for short and long `soil_params` names in config

[aaraney]

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Currently, several NOAA-OWP maintained BMI modules (see https://github.com/NOAA-OWP/SoilFreezeThaw/pull/14#issuecomment-1864879127) share the convention of using soil_params.<x> where x is a parameter name in their config file format. However, when soil_params parameters are exposed as calibratable, the convention is to drop soil_params and just use the parameter name. To avoid confusion and increase consistency, this change enables specifying calibratable cfe soil_params in config files using just their name. Support for the existing soil_params names is maintained.

This PR adds support for specifying calibratable soil_params using their short form. The config readme is updated and clarifies what calibratable parameter names are used when passing to and from BMI.

Changes

• The following parameters can be specified using either name in a config file: alpha_fc <=> soil_params.alpha_fc b <=> soil_params.b maxsmc <=> soil_params.maxsmc satdk <=> soil_params.satdk satpsi <=> soil_params.satpsi slope <=> soil_params.slope wltsmc <=> soil_params.wltsmc Klf <=> K_lf

[aaraney]

Thanks for the review, @ajkhattak! I'm AFK at the moment, but will get these resolved and pushed up today.

[aaraney]

@ajkhattak, just pushed up some changes and responded to your comments.