text: Title: Add MFLES from StatsForecast
  Body: MFLES is a newer model that was implemented in Nixtla's statsforecast:
  https://nixtlaverse.nixtla.io/statsforecast/docs/models/mfles.html
  
  Since there are other StatsForecasts methods (theta/ets/arima etc) hopefully it is easy to add this as well!
  
  Let me know if there are any questions with parameters or the implementation.
  
  
  