Issue #3174373: Allow suspending a queue

Closes #3174373

config/install/advancedqueue.advancedqueue_queue.default.yml

@@ -10,6 +10,7 @@ processor: cron
 processing_time: 90
 locked: false
 stop_when_empty: true
+suspended: false
 threshold:
   type: 0
   limit: 0