Expand Testing for Input Validation

[cyschneck]

Describe the feature you'd like added to this project Expand input validation for existing geoCAT-comp functions with new associated testing

Describe the solution you'd like Expand existing input validation (i.e., float/int vs xarray) across geoCAT-comp functionality with some reasonable custom messages for common errors. New validation should be associated with new testing

Additional context Opened in favor of #254