read data from S3 [WIP]

[xfate123]

add a extra feature to read data from s3 for training purpose, will polish this feature and support the predicting purpose later

[kubeflow-bot]

This change is 

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[xfate123]

/assign @merlintang @richardsliu