Add option to use normalization method for log transformed data

[Elena-kal]

Issue description

Our current normalization by median method assumes that the data is raw and not log transformed (although we do it differently in the standard workflow which is fine for most use cases Chris said.). However, we currently have no way to normalize correctly after log transformation. A correct normalization after a log transformation subtracts instead of dividing.

Acceptance Criteria

• users have the option to use a normalization method that assumes log transformed data
• users can also choose normalization methods that assume "raw" data (not log transformed)