[ENH] sklearn compatible tuning wrapper estimator #85

I would suggest to expose the tuners as sklearn compatible tuning wrappers, e.g.,

HyperactiveCV(sklearn_estimator, config),

or

HyperactiveCV(sklearn_estimator, hyperopt_tuning_algo, config),

where HyperactiveCV inherits from sklearn BaseEstimator, and gets tested by parametrize_with_checks in the CI.