feature: add more field in preemption toleration policy

[googs1025]

Currently, the preemption toleration policy only has minimum-preemptable-priority and toleration-seconds.
like as follows:

apiVersion: scheduling.k8s.io/v1
kind: PriorityClass
metadata:
  name: toleration-policy-sample
  annotations:
    preemption-toleration.scheduling.x-k8s.io/minimum-preemptable-priority: "10000"
    preemption-toleration.scheduling.x-k8s.io/toleration-seconds: "3600"
value: 8000

Now I want to add more fields:
like:
We can exclude Pods in a specific namespace from being preempted
preemption-toleration.scheduling.x-k8s.io/excluded-namespaces: "kube-system,default,critical-ns"

Maybe there are other filters?

[googs1025]

/assign

[googs1025]

/kind feature