1. update clientset, deepcopy using code-generator

2. add a dummy file tools.go to force "go mod vendor" to see
code-generator as dependencies
3. add a script to update CRD
4. add a README to document CRD updating steps
run go mod tidy
update README

vendor/k8s.io/api/storage/v1beta1/zz_generated.deepcopy.go

@@ -98,6 +98,11 @@ func (in *CSIDriverSpec) DeepCopyInto(out *CSIDriverSpec) {
 		*out = new(bool)
 		**out = **in
 	}
+	if in.VolumeLifecycleModes != nil {
+		in, out := &in.VolumeLifecycleModes, &out.VolumeLifecycleModes
+		*out = make([]VolumeLifecycleMode, len(*in))
+		copy(*out, *in)
+	}
 	return
 }