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/Library.yaml

@@ -10,6 +10,12 @@ components:
       description: The ID of the library.
       format: uuid
       example: 'e4bb1afb-4a4f-4dd6-8be0-e615d233185b'
+    libraryIdNullable:
+      type: string
+      description: The ID of the library. Applies to all libraries if `null`.
+      format: uuid
+      nullable: true
+      example: 'e4bb1afb-4a4f-4dd6-8be0-e615d233185b'
     libraryName:
       description: The name of the library.
       type: string