Adds the target_transforms module with the following transformations:
Local Standard Scaler
Local MinMax Scaler
Local Robust Scaler (scale can be IQR or MAD)
Local BoxCox
Global func transformer
Does a minor change to the processing module to make the process method return the data and indptr as separate arrays instead of a GroupedArray object, since the libs have their own extended implementation of the GroupedArray and use that object instead.