Merge pull request #54463 from saad-ali/volumeAttachmentAPI

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Introduce new `VolumeAttachment` API Object

**What this PR does / why we need it**:

Introduce a new `VolumeAttachment` API Object. This object will be used by the CSI volume plugin to enable external attachers (see design [here](https://github.com/kubernetes/community/pull/1258). In the future, existing volume plugins can be refactored to use this object as well.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*:  Part of issue https://github.com/kubernetes/features/issues/178

**Special notes for your reviewer**:
None

**Release note**:

```release-note
NONE
```

Kubernetes-commit: ebe8ea73fd1a961779242dfbb629befa153e96fc

vendor/k8s.io/apimachinery/pkg/watch/zz_generated.deepcopy.go

@@ -20,23 +20,6 @@ limitations under the License.
 
 package watch
 
-import (
-	conversion "k8s.io/apimachinery/pkg/conversion"
-	reflect "reflect"
-)
-
-// GetGeneratedDeepCopyFuncs returns the generated funcs, since we aren't registering them.
-//
-// Deprecated: deepcopy registration will go away when static deepcopy is fully implemented.
-func GetGeneratedDeepCopyFuncs() []conversion.GeneratedDeepCopyFunc {
-	return []conversion.GeneratedDeepCopyFunc{
-		{Fn: func(in interface{}, out interface{}, c *conversion.Cloner) error {
-			in.(*Event).DeepCopyInto(out.(*Event))
-			return nil
-		}, InType: reflect.TypeOf(&Event{})},
-	}
-}
-
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *Event) DeepCopyInto(out *Event) {
 	*out = *in