How to calculate a position across roads in LongitudinalDistance action

Describe the bug

In https://code.asam.net/simulation/openscenario-1/openscenario/-/issues/322 we clarified how to calculate a distance if we have two positions on different roads. But in the LongitudinalDistanceAction the problem is different. Here we have one Position and a distance and need to calculate the second position. Here the route algorithm (shortest, fastest...) doesn't apply. Also the RouteAlgorithm attribute for the LateralDistanceAction is not meaningful.
We need to find a concept for the classes LongitudinalDistanceAction, RelativeLanePosition and RelativeRoadPosition.

Describe the expected behavior

We need to clarify which additional attribute we need for the Longitudinal/LateralDistanceAction and delete the new routeAlgorithm attribute from these classes.

Additional context

https://code.asam.net/simulation/openscenario-1/openscenario/-/issues/322