Added vm attach detach data disk cli command

Author: nitinjainms

src/azure-cli/azure/cli/command_modules/vm/aaz/latest/vm/disk/__cmd_group.py

@@ -11,6 +11,10 @@
 from azure.cli.core.aaz import *
 
 
+@register_command_group(
+    "vm disk",
+    is_preview=True,
+)
 class __CMDGroup(AAZCommandGroup):
     """Manage the managed data disks attached to a VM.
 

src/azure-cli/azure/cli/command_modules/vm/aaz/latest/vm/disk/_attach_detach_data_disk.py

@@ -11,6 +11,10 @@
 from azure.cli.core.aaz import *
 
 
+@register_command(
+    "vm disk attach-detach-data-disk",
+    is_preview=True,
+)
 class AttachDetachDataDisk(AAZCommand):
     """Attach and detach data disks to/from the virtual machine.
     """