Heterogeneous Fleets

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Support different types of vehicles such as walk, bike, car.
Could also be used to model "skill sets" when dispatching employees.

This requires the user to hand us vehicle-class specific
- cost matrices
- duration matrices
- capacities

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Implementation:

For Costs:

Use `SetArcCostEvaluatorOfVehicle` and provide callback on a per-vehicle basis. We now require numVehicle cost matrices from the user.

For Time Dimension:

Use `AddDimensionWithVehicleTransits`. Takes a vector of transition time evaluators _per vehicle_ for pairs of nodes. `Evaluator(i, j) { return ServiceTime(i) + TransitionTime(i, j); }`. We now require numVehicle duration matrices from the user.

For Capacity Dimension:

Use `AddDimensionWithVehicleCapacity`. See explanation above.

For Time and Capacity:

Use `AddDimensionWithVehicleTransitAndCapacity`. See explanation above.

Parti dai punti di ingresso del vehicle routing che espongono SetArcCostEvaluatorOfVehicle, AddDimensionWithVehicleTransits, AddDimensionWithVehicleCapacity e AddDimensionWithVehicleTransitAndCapacity. Traccia come sono attualmente rappresentati gli input di costo, durata e capacità, quindi verifica che ciascuno supporti matrici per veicolo e flotte eterogenee.

Scritto dal modello di indicizzazione a partire dal testo della issue.