Supress C++ stoplist extraction warnings if only called once or twice

[fxjung]

For a perfectly fine simulation, we always get a bunch of warnings:

/home/jung/Desktop/data/code/ridepy/ridepy/fleet_state.py:290: UserWarning: Extracting the C++ stoplist will impact performance
  "location": fleet_state.stoplist[0].location,
/home/jung/Desktop/data/code/ridepy/ridepy/extras/simulation_set.py:253: UserWarning: disregarding params['general']['n_vehicles']=10
  warnings.warn(f"disregarding {params['general']['n_vehicles']=}")
/home/jung/Desktop/data/code/ridepy/ridepy/fleet_state.py:290: UserWarning: Extracting the C++ stoplist will impact performance
  "location": fleet_state.stoplist[0].location,
/home/jung/Desktop/data/code/ridepy/ridepy/fleet_state.py:329: UserWarning: Extracting the C++ stoplist will impact performance
  vehicle.stoplist[-1].estimated_arrival_time
/home/jung/Desktop/data/code/ridepy/ridepy/fleet_state.py:342: UserWarning: Extracting the C++ stoplist will impact performance
  "location": fleet_state.stoplist[0].location,
/home/jung/Desktop/data/code/ridepy/ridepy/fleet_state.py:329: UserWarning: Extracting the C++ stoplist will impact performance
  vehicle.stoplist[-1].estimated_arrival_time
/home/jung/Desktop/data/code/ridepy/ridepy/fleet_state.py:342: UserWarning: Extracting the C++ stoplist will impact performance
  "location": fleet_state.stoplist[0].location,
/home/jung/Desktop/data/code/ridepy/ridepy/fleet_state.py:329: UserWarning: Extracting the C++ stoplist will impact performance
  vehicle.stoplist[-1].estimated_arrival_time
/home/jung/Desktop/data/code/ridepy/ridepy/fleet_state.py:342: UserWarning: Extracting the C++ stoplist will impact performance
  "location": fleet_state.stoplist[0].location,
/home/jung/Desktop/data/code/ridepy/ridepy/fleet_state.py:329: UserWarning: Extracting the C++ stoplist will impact performance

This should not be.
--> Either implement a counter in VehicleState.pyx to only warn after a certain number of calls, or suppress warnings temporarily in FleetState.py.