KEP 5933: Add x-kubernetes-sensitive-data marker for CRD fields

[trofimovdals]

Introduces x-kubernetes-sensitive-data vendor extension that enables field stripping on get/list/watch for unauthorized callers and unconditional masking of sensitive values in audit log entries.

• One-line PR description: Add support for marking CRD fields as sensitive with RBAC-gated access, and audit log masking

• Issue link: CRD Sensitive Data Protection #5933

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