predict_params is not passed everywhere in MapieClassifier in some settings

[Valentin-Laurent]

Predict params are not passed to the underlying classifiers in some settings:

• In mapie/estimator/classifier.py, in the prefit setting, we should pass predict_params. Here is the code to fix:

if self.cv == "prefit":
            y_pred_proba = self.single_estimator_.predict_proba(X)
            y_pred_proba = self._check_proba_normalized(y_pred_proba)

• In mapie/conformity_scores/sets/raps.py, same issue. Fixing this is a bit trickier since the get_conformity_scores score method currently doesn't have access to predict_params. Here is the code to fix:

        self.y_pred_proba_raps = (
            self.predictor.single_estimator_.predict_proba(self.X_raps)
        )

• We should clarify in the doctstring that predict_params are passed to both predict and predict_proba methods. This may be subject to discussion as this implementation choice may not be relevant.
• Optional: implement tests to check that the above works