feat(integrations): add search.ch integration with timetable widget (#5180)

packages/integrations/src/interfaces/timetable/timetable-integration.ts

@@ -0,0 +1,6 @@
+import type { Station, Timetable, TimetableOptions } from "./timetable-types";
+
+export interface TimetableIntegration {
+  searchStationsAsync(query: string): Promise<Station[]>;
+  getTimetableAsync(options: TimetableOptions): Promise<Timetable>;
+}