This adds the policy CRD APIs for `Server` and `ServerAuthorization` CRDs.
The structure of each (in their respective `types.go`) is based off the `policy-crd.yaml` specs for each CRD.
Unlike service profiles, servers and server authorizations use the `oneof` extensively so I encoded that as a struct with a pointer for each possible `oneof`. For example, a server's `PodSelector` is either `MatchExpressions` or `MatchLabels`. Therefore, a `PodSelector` is defined as:
```
type PodSelector struct {
MatchExpressions *MatchExpressions
MatchLabels *MatchLabels
}
```
Closes#6970
Signed-off-by: Kevin Leimkuhler <kevin@kleimkuhler.com>
Kevin Leimkuhler