Referential Authorization

@robscott

One-line enhancement description (can be used as a release note): Move ReferenceGrant to new sig-auth API Group
Kubernetes Enhancement Proposal: KEP-3766: Move ReferenceGrant to sig-auth API Group #3767
Discussion Link: https://groups.google.com/g/kubernetes-sig-auth/c/akUOI3gea0c
Primary contact (assignee): @robscott
Responsible SIGs: sig-auth, closely related to sig-network and sig-storage
Enhancement target (which target equals to which milestone):
- Alpha release target (x.y): 1.30
- Stable release target (x.y):
Beta
- KEP (k/enhancements) update PR(s):
- Code (k/k) update PR(s):
- Docs (k/website) update(s):
Stable
- KEP (k/enhancements) update PR(s):
- Code (k/k) update PR(s):
- Docs (k/website) update(s):

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