CON-72-story(notifications): admin receives notification when device is not seen in a while

- setup queue manager for when notifications are sent
- implement notifications when device is not seen in a while

[Delivers CON-72]

Author: [Arusey]

utilities/utility.py

@@ -89,6 +89,7 @@ class QuestionType(enum.Enum):
     missingitem = "missing_items"
 
 
+
 class StatusType(enum.Enum):
     read = "read"
     unread = "unread"