text: Title: add jupyter notebook examples for the SklearnTransformerWrapper
  Body: At the moment there is only 1 notebook showing how to wrap the one hot encoder, simple imputer and standard scaler from sklearn. I would like to separate each one of these in an individual notebook.
  
  In addition, I would like to add notebooks demonstrating how to wrap for example the PowerTransformer, the FunctionTransformer and the Feature selection methods.
  
  
  