Add doc for data persistence plugin#920

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pingsutw wants to merge 3 commits intomasterfrom

persistence-layer

Commits on Nov 3, 2022

wip
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Commits on Nov 7, 2022

Add doc for data persistence plugin
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Commits on Nov 8, 2022

Merge branch 'master' of github.com:flyteorg/flytesnacks into persistence-layer
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