[Feature] add CatBoost

[ChungsooKim]

Because we usually use categorical features for prediction, it would be great if we can implement CatBoost in our PLP frameworks.

https://catboost.ai/ https://github.com/catboost/catboost

you can see a cheatsheet in #376 issue and its PR for the package implementation.

@bumchul95 @dongyun909 have started this!