feat(crd-gen): automate the CRDs generation with validations for APIs (#75)

- To generate the CRD spec `make manifest` generate then under
  deploy/yamls directory
- added a update-crd script to automate the steps to generate
  CRDs and its validation of each types

Signed-off-by: prateekpandey14 <prateek.pandey@mayadata.io>

pkg/apis/openebs.io/zfs/v1alpha1/zfssnapshot.go

@@ -25,6 +25,8 @@ import (
 // +resource:path=zfssnapshot
 
 // ZFSSnapshot represents a ZFS Snapshot of the zfsvolume
+// +kubebuilder:object:root=true
+// +kubebuilder:resource:scope=Namespaced,shortName=zfssnap
 type ZFSSnapshot struct {
 	metav1.TypeMeta   `json:",inline"`
 	metav1.ObjectMeta `json:"metadata,omitempty"`