[Feature Request] Hyper Parameter Tuning

**Is your feature request related to a problem? Please describe.**
Many Machine learning algorithms take additional hyper parameters which can affect the model performance quite a bit. Finding the best hyper parameter values is called hyper parameter tuning (HPT). There are several approaches to do this.

**Describe the solution you'd like**
IMO having some kind of HPT framework and some HPT algorithms could well complement the set of machine learning algorithms implemented in FSharp.Stats.