* feat: Add getters for GaussianNB
* Add classes getter to BernoulliNB
Add classes getter to CategoricalNB
Add classes getter to MultinomialNB
* Add feature_log_prob getter to MultinomialNB
* Add class_count to NB structs
* Add n_features getter for NB
* Add feature_count to MultinomialNB and BernoulliNB
* Add n_categories to CategoricalNB
* Implement feature_log_prob and category_count getter for CategoricalNB
* Implement feature_log_prob for BernoulliNB