From describes the trusted namespaces and kinds that can reference the
resources described in "To". Each entry in this list MUST be considered
to be an additional place that references can be valid from, or to put
this another way, entries MUST be combined using OR.
To describes the resources that may be referenced by the resources
described in "From". Each entry in this list MUST be considered to be an
additional place that references can be valid to, or to put this another
way, entries MUST be combined using OR.
Spec defines the desired state of ReferenceGrant.