Add the possibility to compute the NormalizeIntensity inverse

[sh3rlock14]

When applying the NormalizeIntensity transform (w/o passing subtrahend and divisor), the computed _sub and _div should be added to the meta information. This would be helpful in getting back the original intensity values: not only this could be useful for recon. problems, but also for logging.
I tried to expand NormalizeIntensity and NormalizeIntensityd funcs by updating the metadata, but unsuccessfully.

[wyli]

sure, let me convert this into a feature request (#5647)