Add CRDs for VolumeGroupSnapshots management

This commit introduces three new CustomResourceDefinitions (CRDs) for managing volume group snapshots within Kubernetes clusters:
1. VolumeGroupSnapshotClasses: Defines the properties and parameters required for volume group snapshot classes.
2. VolumeGroupSnapshotContents: Details the structure and management of on-disk group snapshot contents.
3. VolumeGroupSnapshots: Specifies user requests and properties for creating or binding to group snapshots.

Each CRD is equipped with comprehensive specs, including fields like deletionPolicy, driver, and creationTime, tailored to enhance management capabilities and integration with the CSI driver specifications.

Approved API references:
- VolumeGroupSnapshotClasses: kubernetes-csi/external-snapshotter#814
- VolumeGroupSnapshotContents and VolumeGroupSnapshots: kubernetes-csi/external-snapshotter#1068

Signed-off-by: Manish <myathnal@redhat.com>

test/e2e/testing-manifests/storage-csi/external-snapshotter/groupsnapshot.storage.k8s.io_volumegroupsnapshotclasses.yaml

@@ -0,0 +1,94 @@
+---
+apiVersion: apiextensions.k8s.io/v1
+kind: CustomResourceDefinition
+metadata:
+  annotations:
+    api-approved.kubernetes.io: "https://github.com/kubernetes-csi/external-snapshotter/pull/814"
+    controller-gen.kubebuilder.io/version: v0.15.0
+  name: volumegroupsnapshotclasses.groupsnapshot.storage.k8s.io
+spec:
+  group: groupsnapshot.storage.k8s.io
+  names:
+    kind: VolumeGroupSnapshotClass
+    listKind: VolumeGroupSnapshotClassList
+    plural: volumegroupsnapshotclasses
+    shortNames:
+    - vgsclass
+    - vgsclasses
+    singular: volumegroupsnapshotclass
+  scope: Cluster
+  versions:
+  - additionalPrinterColumns:
+    - jsonPath: .driver
+      name: Driver
+      type: string
+    - description: Determines whether a VolumeGroupSnapshotContent created through
+        the VolumeGroupSnapshotClass should be deleted when its bound VolumeGroupSnapshot
+        is deleted.
+      jsonPath: .deletionPolicy
+      name: DeletionPolicy
+      type: string
+    - jsonPath: .metadata.creationTimestamp
+      name: Age
+      type: date
+    name: v1alpha1
+    schema:
+      openAPIV3Schema:
+        description: |-
+          VolumeGroupSnapshotClass specifies parameters that a underlying storage system
+          uses when creating a volume group snapshot. A specific VolumeGroupSnapshotClass
+          is used by specifying its name in a VolumeGroupSnapshot object.
+          VolumeGroupSnapshotClasses are non-namespaced.
+        properties:
+          apiVersion:
+            description: |-
+              APIVersion defines the versioned schema of this representation of an object.
+              Servers should convert recognized schemas to the latest internal value, and
+              may reject unrecognized values.
+              More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources
+            type: string
+          deletionPolicy:
+            description: |-
+              DeletionPolicy determines whether a VolumeGroupSnapshotContent created
+              through the VolumeGroupSnapshotClass should be deleted when its bound
+              VolumeGroupSnapshot is deleted.
+              Supported values are "Retain" and "Delete".
+              "Retain" means that the VolumeGroupSnapshotContent and its physical group
+              snapshot on underlying storage system are kept.
+              "Delete" means that the VolumeGroupSnapshotContent and its physical group
+              snapshot on underlying storage system are deleted.
+              Required.
+            enum:
+            - Delete
+            - Retain
+            type: string
+          driver:
+            description: |-
+              Driver is the name of the storage driver expected to handle this VolumeGroupSnapshotClass.
+              Required.
+            type: string
+          kind:
+            description: |-
+              Kind is a string value representing the REST resource this object represents.
+              Servers may infer this from the endpoint the client submits requests to.
+              Cannot be updated.
+              In CamelCase.
+              More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds
+            type: string
+          metadata:
+            type: object
+          parameters:
+            additionalProperties:
+              type: string
+            description: |-
+              Parameters is a key-value map with storage driver specific parameters for
+              creating group snapshots.
+              These values are opaque to Kubernetes and are passed directly to the driver.
+            type: object
+        required:
+        - deletionPolicy
+        - driver
+        type: object
+    served: true
+    storage: true
+    subresources: {}