feat(sample): add visualization example with tensorboard and pvc

[hsinhoyeh]

Description of your changes:

This shows an example on how to use tensorboard on top of persistent volume claim.

Checklist:

• [ x ] The title for your pull request (PR) should follow our title convention. Learn more about the pull request title convention used in this repository.

[google-oss-prow[bot]]

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[google-oss-prow[bot]]

Hi @hsinhoyeh. Thanks for your PR.

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[zijianjoy]

cc @chensun Would you like to help reviewing this PR?