chore: moves xapi-db-data demo script and config into OARS plugin

[pomegranited]

Does what it says on the box :)

Discussions

See https://github.com/openedx/openedx-oars/issues/30

Testing instructions

See https://github.com/openedx/tutor-contrib-oars/pull/3

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[mphilbrick211]

@bmtcril hi there! If this is good-to-go, would you mind merging?

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