Function getProgressAtNearestRoutePoint

getProgressAtNearestRoutePoint(
route: Route,
point: HasLngLat,
): RouteCoordinateAtProgress | undefined
Returns the geographic coordinate and cumulative progress values at the point on a route nearest to the given location.

Projects point onto the route line using nearestPointOnLine, then linearly interpolates the progress data at the snapped position between the two bracketing route vertices.
Parameters
- route: Route
  The route to query. Must contain properties.progress data.
- point: HasLngLat
  The reference location to snap to the route.
Returns RouteCoordinateAtProgress | undefined
Interpolated RouteCoordinateAtProgress at the nearest point, or undefined when:
- the route has no progress data
- the route has fewer than 2 coordinates
- the progress data is incomplete for the snapped position
Example
```
const result = getProgressAtNearestRoutePoint(route, { lng: 4.92, lat: 52.32 });
if (result) {
  console.log(`Nearest point: [${result.position}]`);
  console.log(`${result.distanceInMeters} m from route start`);
  console.log(`${result.travelTimeInSeconds} s travel time from route start`);
}
```