Merge pull request #48377 from bsalamat/priority_class

Automatic merge from submit-queue

Add PriorityClass API object under new "scheduling" API group

**What this PR does / why we need it**: This PR is a part of a series of PRs to add pod priority to Kubernetes. This PR adds a new API group called "scheduling" with a new API object called "PriorityClass". PriorityClass maps the string value of priority to its integer value.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #

**Special notes for your reviewer**: Given the size of this PR, I will add the admission controller for the PriorityClass in a separate PR.

**Release note**:

```release-note
Add PriorityClass API object under new "scheduling" API group
```

ref/ #47604
ref/ #48646

Author: Kubernetes Submit Queue

apis/openapi-spec/swagger.json

@@ -13325,6 +13325,11 @@
       "version": "v1beta1",
       "kind": "DeleteOptions"
      },
+     {
+      "group": "scheduling.k8s.io",
+      "version": "v1alpha1",
+      "kind": "DeleteOptions"
+     },
      {
       "group": "settings.k8s.io",
       "version": "v1alpha1",
@@ -13813,6 +13818,11 @@
       "version": "v1beta1",
       "kind": "WatchEvent"
      },
+     {
+      "group": "scheduling.k8s.io",
+      "version": "v1alpha1",
+      "kind": "WatchEvent"
+     },
      {
       "group": "settings.k8s.io",
       "version": "v1alpha1",