xgboost translation

[edgararuiz-zz]

Look into adding xgboost translation

[JiaxiangBU]

Hi, @edgararuiz I follow this package for a while, search for some way to do Xgboost in SQL.

I think there is a good source to solve the binary classification problem in the Xgboost Model. I test his code and use it in the production now.

Maybe the translated code is too long in SQL (about 6000 lines), but in Hive, it just costs 23 seconds in my recent experience.

I do a little test on the mtcars dataset, I think it maybe helps you.

[edgararuiz-zz]

Ok @JiaxiangBU I'll take a look, thank you so much for these references.

[edgararuiz-zz]

Fixed by #43

[github-actions]

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