Add ts_ids optional parameter to SumoEnvironment to enable traffic light filtering

[bsagarzazu]

I added an optional parameter ts_ids to the SumoEnvironment class.

This allows specifying a subset of traffic lights to be controlled by SUMO-RL. Other traffic lights remain in the simulation and follow their original logic. It is useful for experiments where only certain traffic lights need RL control, without modifying the simulation itself.

If ts_ids is None, all traffic lights in the simulation are controlled by default, preserving existing functionality.