API: HafasTrip: replace polyline hash with actual polyline polygon data

[xanderio]

Is your feature request related to a problem? Please describe. The HafasTrip that is returned with a status contains a polyline field its seams to be some datebase internal hash. This is quite useless while working with the API

Describe the solution you'd like Replacing the polyline hash with the actual polyline polygon data

Describe alternatives you've considered A possible alternative would be a separate endpoint to request this data, but this could create a high request load while loading multiple polylines in a frontend. A possible solution to this problem would be a API that allow to request multiple polyline polygon.