Metadata multi-user support CUJ & design

[zhenghuiwang]

/kind feature

Describe the solution you'd like

• What the multi-user ACL support looks like.
• How can the CUJs be implemented.

[jtfogarty]

/area multiuser
/kind feature
/priority p2

[k8s-ci-robot]

@jtfogarty: The label(s) area/multiuser cannot be applied, because the repository doesn't have them

In response to this:

/area multiuser
/kind feature
/priority p2

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[jtfogarty]

/area engprod