Implement support for notifications (#12523)

* Setup basic notification page

* Add basic notification implementation

* Register for push notifications

* Implement dispatching

* Add fields

* Handle image and link

* Add notification config

* Add field for users notification tokens

* Implement saving of notification tokens

* Implement VAPID key generation

* Implement public key encoding

* Implement webpush from server

* Implement push notification handling

* Make notifications config only

* Add maskable icon

* Use zod form to control notification settings in the UI

* Use js

* Always open notification

* Support multiple endpoints

* Handle cleaning up expired notification registrations

* Correctly unsubscribe notifications

* Change ttl dynamically

* Add note about notification latency and features

* Cleanup docs

* Fix firefox pushes

* Add links to docs and improve formatting

* Improve wording

* Fix docstring

Co-authored-by: Blake Blackshear <blake@frigate.video>

* Handle case where native auth is not enabled

* Show errors in UI

---------

Co-authored-by: Blake Blackshear <blake@frigate.video>

web/site.webmanifest

@@ -20,6 +20,12 @@
       "sizes": "180x180",
       "type": "image/png",
       "purpose": "maskable"
+    },
+    {
+      "src": "/images/maskable-badge.png",
+      "sizes": "96x96",
+      "type": "image/png",
+      "purpose": "maskable"
     }
   ],
   "theme_color": "#ffffff",