Add support Successive Halving estimators for hyperparameter turning

Scikit-learn adds support for better parameter tuning algorithm called [successive halving](https://scikit-learn.org/stable/auto_examples/release_highlights/plot_release_highlights_0_24_0.html#successive-halving-estimators-for-tuning-hyper-parameters). They are drop-in replacements for `GridSearchCV` so we should add support for them too.