Deprecate intree Volume Expansion controller

pkg/controller/volume/expand/expand_controller.go

@@ -68,6 +68,8 @@ type CSINameTranslator interface {
 	GetCSINameFromInTreeName(pluginName string) (string, error)
 }
 
+// Deprecated: This controller is deprecated and for now exists for the sole purpose of adding
+// necessary annotations if necessary, so as volume can be expanded externally in the control-plane
 type expandController struct {
 	// kubeClient is the kube API client used by volumehost to communicate with
 	// the API server.

pkg/volume/util/operationexecutor/operation_generator.go

@@ -1679,6 +1679,8 @@ func (og *operationGenerator) GenerateExpandAndRecoverVolumeFunc(
 	}, nil
 }
 
+// Deprecated: This function should not called by any controller code in future and should be removed
+// from kubernetes code
 func (og *operationGenerator) expandAndRecoverFunction(resizeOpts inTreeResizeOpts) inTreeResizeResponse {
 	pvc := resizeOpts.pvc
 	pv := resizeOpts.pv