Restart the SUMO process based on map change

[liamchzh]

A few months ago, we made a change that forces the reinitialization of TRACI and the SUMO process to prevent the simulation from freezing. This change causes overhead costs, especially when switching between large maps.

A better way to decide whether to restart the SUMO process or not is based on the map. Ideally, we restart SUMO only if the map changes, otherwise, just reset everything.