[ENH] AEP: new module for channel selection #1270
Description
Describe the feature or idea you want to propose
we are researching the best way of channel selection for EEG, but it is applicable generally. Over the summer we will introduce new functionality. Currently we have a single file called channel_selection containing two BaseCollectionTransformers, ElbowClassSum and ElbowClassPairwise .
Describe your proposed solution
I propose a new submodule in transformation.collection called channel_selection and refactoring the these two into a file _elbow_class, with deprecation of the old ones in 0.9
Describe alternatives you've considered, if relevant
No response
Additional context
No response