chore: handle notifications from websockets (#2472)

packages/services/src/Domain/Api/WebSocketsEventData.ts

@@ -0,0 +1,7 @@
+import { Either } from '@standardnotes/common'
+import { UserRolesChangedEventPayload, NotificationAddedForUserEventPayload } from '@standardnotes/domain-events'
+
+export interface WebSocketsEventData {
+  type: string
+  payload: Either<UserRolesChangedEventPayload, NotificationAddedForUserEventPayload>
+}