Adding colab notebook for XGBoost Regression and Classification

[jineetd]

Example notebook added for XGBoost regression and classification.

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[xzdandy]

Hi @jineetd, thanks for adding the notebook. After a second thought, given the regression is using the same dataset and we want user to only look at one notebook for regression and classification, I think it will be better for you to directly add the xgboost in to the existing https://github.com/georgia-tech-db/evadb/blob/staging/tutorials/17-home-rental-prediction.ipynb. We also want to compare the ludwig and xgboost to give some guidance on which model we should use. We can add the comparison and guidance in later PRs. Could you share with me the classification dataset you are using? We will add to a preloaded postgres instance to simplify the data load section.

[xzdandy]

For tutorials/19-employee-classification-prediction.ipynb, there is no output for the last several queries, could you run them?Thanks!