[PodSecurity] Add v1 config API (pod-security.admission.config.k8s.io)

[tallclair]

GA blocker (kubernetes/enhancements#2579)

/sig auth
/milestone v1.25
/help

[k8s-ci-robot]

@tallclair:
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In response to this:

GA blocker (kubernetes/enhancements#2579)

/sig auth
/milestone v1.25
/help

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[k8s-ci-robot]

@tallclair: This issue is currently awaiting triage.

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[wangyysde]

/assign