From which package can I import the route generator?

I could not find the corresponding section for this question so I chose to ask here.

My problem is that I would like to get all possible routes from a lanelet_network. I was planning to use RoutePlanner but then I realized my dataset is just pure lanelets without any PlanningProblem. I could not initialize the object RoutePlanner without a planning problem. The alternative would be using RouteGenerator which mentioned in this documentation Route Generator - CommonRoad Route Planner

But I just couldn’t find the package anywhere in the commonroad-route-planner repo.

Do you want all routes from an initial state to all lanelets or from all lanelets to all other lanelets?