Add argument termination_grace_period_seconds (#58)

xpk.py

@@ -97,6 +97,7 @@
               priorityClassName: {args.priority}
               hostNetwork: true
               dnsPolicy: ClusterFirstWithHostNet
+              terminationGracePeriodSeconds: {args.termination_grace_period_seconds}
               containers:
               {container}
                 volumeMounts:
@@ -2994,6 +2995,16 @@ def directory_path_type(value):
     ),
 )
 
+workload_create_parser_optional_arguments.add_argument(
+    '-tgps', '--termination-grace-period-seconds', 
+    type=str,
+    default='30',
+    help=(
+        'Maximum wait time for a workload Pod to wrap up after a disruption event or deletion request.'
+        'Defaults to 30 seconds.'
+    ),
+)
+
 workload_create_parser.set_defaults(func=workload_create)
 
 # "job delete" command parser.