Find a safe way to load and store models for RI prediction

[hechth]

Find out how scipy can store a model and how it can be loaded. Pickle is not considered safe so a different method should be used to be able to import a trained model.

[wverastegui]

While still under development, skops appears to be a more secure alternative to pickle and joblib (https://skops.readthedocs.io/en/stable/persistence.html). Also, most types from numpy and scipy should be supported according to the documentation.

[hechth]

Another option is using ONNX