Create new apply function that applies PLSR models to new data

[serbinsh]

apply_plsr(..) to take plsr coefficients/permutation coefficients and input spectra matrix to generate new values in a dataframe.

Options should be:
input coefficients as either R object or a specific file(s)
Input reflectance as either an R matrix or a specific file
wavelength prefix (e.g. "Wave_")
metadata_columns - those in the input spectra to keep in the output object

I don't see this overly complicated but we will want to have a check that wavelengths match. also need to indicate if there is an intercept and where it is.

Im sure other considerations will come up.

Use EcoSIS spectra and built-in coefficients as examples

As part of this build in the Serbin et al 2019 LMA coefficients

[serbinsh]

Would want the functionality to match something like this script:

https://github.com/TESTgroup-BNL/spectratrait/blob/perc_rmse_fix/vignettes/apply_sserbin2019_plsr_to_neon_example.md

but with more flexibility and to simplify how to do this for end users

could add the option to use github files for coefficients like in this script example