Save and load scalers to netCDF

[djgagne]

One necessary component for running ML models inside Fortran models is successfully transferring the scalers over as well. NCAR community models support netCDF format as a standard binary format, and it can hold all common data types plus documentation. If we can export to netCDF then we should be able to support reading in netCDF with netCDF Fortran. I suggest using xarray to create a Dataset from the scaler features and then save to netCDF.