api: add volumeGroupAttributes field to VGRContent API

This commit introduces `volumeGroupAttributes` field to
`VolumeGroupReplicationContent` API.

Signed-off-by: Praveen M <m.praveen@ibm.com>

Author: iPraveenParihar

api/replication.storage/v1alpha1/volumegroupreplicationcontent_types.go

@@ -53,6 +53,10 @@ type VolumeGroupReplicationContentSpec struct {
 	// +kubebuilder:validation:Required
 	VolumeGroupReplicationClassName string `json:"volumeGroupReplicationClassName"`
 
+	// volumeGroupAttributes holds the attributes of the volume group.
+	// +kubebuilder:validation:Optional
+	VolumeGroupAttributes map[string]string `json:"volumeGroupAttributes,omitempty"`
+
 	// Source specifies whether the volume group is (or should be) dynamically provisioned
 	// or already exists using the volumes listed here, and just requires a
 	// Kubernetes object representation.