i_traffic_area_stream: query lane info from stream position

This commit extends the i_traffic_area_stream interface to allow users to retrieve detailed lane information, such number of adjacent lanes or lane type.This is useful for implementations that need to distinguish between lane types, such as "drivable for vehilces" or if special behavior depending on the number of lanes is required.

Note that the added lane types follow the latest ASAM OSI specification.