Add persistent volumes info to storage class submenu (#2160)

Signed-off-by: vshakirova <vshakirova@mirantis.com>

src/renderer/components/+storage-classes/storage-class.store.ts

@@ -2,10 +2,15 @@ import { KubeObjectStore } from "../../kube-object.store";
 import { autobind } from "../../utils";
 import { StorageClass, storageClassApi } from "../../api/endpoints/storage-class.api";
 import { apiManager } from "../../api/api-manager";
+import { volumesStore } from "../+storage-volumes/volumes.store";
 
 @autobind()
 export class StorageClassStore extends KubeObjectStore<StorageClass> {
   api = storageClassApi;
+
+  getPersistentVolumes(storageClass: StorageClass) {
+    return volumesStore.getByStorageClass(storageClass);
+  }
 }
 
 export const storageClassStore = new StorageClassStore();