Notification endpoints (#3096)

* Initial notification schema

* Add: notification event and settings schema

* Add: NotificationController

* Update bundled spec

* Fix: `operationId` typos

* Fix: library response to be arroy of objects

* Fix: notification ID is not uuid

* Add: `nullable` notification creation parameters

* Nullable libraryId schema

* Remove: `id` from Notification requestBody

* Fix: `allOf` for `libraryItemSequence`

* Fix: required `id` in wrong body

* Fix: libraryItem typos

* Update: bundled spec

docs/objects/LibraryItem.yaml

@@ -69,4 +69,7 @@ components:
       description: A single item on the server, like a book or podcast. Includes series sequence information.
       allOf:
         - $ref: '#/components/schemas/libraryItemBase'
-        - $ref: './entities/Series.yaml#/components/schemas/sequence'
+        - type: object
+          properties:
+            sequence:
+              $ref: './entities/Series.yaml#/components/schemas/sequence'