text: Title:  [QUESTION] Croston and add_encoders
  Body: Hi,
  
  I cant get add_encoders functionality (for Croston) to work, see below
  
  ![image](https://github.com/unit8co/darts/assets/126782748/51e57b3b-976a-4b4c-b69b-749a1ffa34ff)
  
  temporal_cv_lf basically just calls 
  
  m = Croston(**params)
  
  **m.historical_forecasts**(series=series,
                                                        forecast_horizon=forecast_horizon,
                                                        last_points_only=False,
                                                        overlap_end=False,
                                                        stride=1,
                                                        retrain=True))
  
  Any help would be appreciated
  