feat: expose hyper tuning module in model_selection (#179)

* feat: expose hyper tuning module in model_selection

* Move to a folder

Co-authored-by: Luis Moreno <morenol@users.noreply.github.com>

src/model_selection/mod.rs

@@ -110,8 +110,10 @@ use crate::math::num::RealNumber;
 use crate::rand::get_rng_impl;
 use rand::seq::SliceRandom;
 
+pub(crate) mod hyper_tuning;
 pub(crate) mod kfold;
 
+pub use hyper_tuning::{grid_search, GridSearchResult};
 pub use kfold::{KFold, KFoldIter};
 
 /// An interface for the K-Folds cross-validator