preserve unknown fields in vulnerabilityreport

I built a custom operator (https://github.com/telekom-mms/trivy-dojo-report-operator)
that uses the kopf-operator (github.com/nolar/kopf/) framework.
This framework can act on kubernetes-resource creation. To detect which resources
were already worked on, kopf adds a the last state of the resource as an
annotation or status to the resource.I cannot use the annotation-feature, because
of this issue: kubernetes-sigs/kubebuilder#2556 (annotations
get too long).

So my proposal is to preseve unknown fields in the vulnerabilityreport-crd. This way
I can add a status-field which kopf then can use to store the state.

deploy/helm/crds/aquasecurity.github.io_vulnerabilityreports.yaml

@@ -261,6 +261,7 @@ spec:
             - updateTimestamp
             - vulnerabilities
             type: object
+            x-kubernetes-preserve-unknown-fields: true
         required:
         - report
         type: object