text: Title: [Question] Opinions on including SplineTransformer as feature preprocessing step
  Body: I was wondering if there were any plans of bringing the [SplineTransformer() preprocessor](https://scikit-learn.org/stable/modules/generated/sklearn.preprocessing.SplineTransformer.html) into `auto-sklearn` (it became available in `sklearn` in a newer version that what is currently being used). I have been testing it recently as a custom component and it has been achieving great results for me although I am aware it is the type of preprocessor that could result in models with poor generalization capacity due to its nature.
  
  Have you worked with this preprocessor before? What are your opinions about including it in an automated ML workflow such as `auto-sklearn`?
  