[feature request] pod-readiness-controller modify Pod use Patch instead of Update

[Spground]

What would you like to be added:

Why is this needed:

[zmberg]

Anyone interested in submitting this patch?

related code: https://github.com/openkruise/kruise/blob/master/pkg/controller/podreadiness/pod_readiness_controller.go#L132

Methods are as follows:

		// patch pod condition
		status := v1.PodStatus{
			Conditions: []v1.PodCondition{
				{
					Type:               appspub.KruisePodReadyConditionType,
					Status:             v1.ConditionTrue,
					LastTransitionTime: metav1.Now(),
				},
			},
		}
		by, _ := json.Marshal(status)
		patchBody := fmt.Sprintf(`{"status":%s}`, string(by))
		rcvObject := &v1.Pod{ObjectMeta: metav1.ObjectMeta{Namespace: pod.Namespace, Name: pod.Name}}
		err := r.Status().Patch(context.TODO(), rcvObject, client.RawPatch(types.StrategicMergePatchType, []byte(patchBody)))

[BruceAko]

/assign
I am willing to submit the patch.