Examples for LightGBM Autologging

LightGBM autologging functionalities are demonstrated through two examples. The first example in the lightgbm_native folder logs a Booster model trained by lightgbm.train(). The second example in the lightgbm_sklearn folder shows how autologging works for LightGBM scikit-learn models. The autologging for all LightGBM models is enabled via mlflow.lightgbm.autolog().