Have a load time per location determined by the number of containers

[Zebreu]

We currently have a load time set per location, for example:

"optimized_region": ["West"],
      "Start_Point": ["waste_basket"],
      "End_Point": ["West-UNLOAD"],
      "load_time": 2.5,
      "trips_vehicle_profile": [["3wheeler", 50]],
      "enable_unload": false,
      "unload_vehicles": [],
      "hours_allowed": 5

We would like to support multiplying this value by the number of containers present at every location. This should be enabled by an extra config option per zone (as seen above).

[Zebreu]

Rereading the code, we support a version of this already, we need to expose the option properly. We'll create a service time array per location and read that in as opposed to using a constant (def get_optimal_route in optimization.py to change, for example)