update scripts

-rearranging model creation script
-st.cache_data

Preprocessed spectra visualization
visualization of Selected intervalls by the wrapper TPE-PLS method

- Implementing CV and visualizing the results
- Organization des classes des algos de régression

- generate testing folds(index)
- cross validating the model
- compute scoring metrics for each fold
- the global cv scoring metrics
- ycv

Adding Preprocessing to models
Adding selected spectral regions in intervall Pls

- Updating Evaluation metrics

Error correction (Model creation section)
Spectral Preprocessing (Pretreatment)

modifications were incorporated