Parking Reservation System (AKA Valet/Chope)

[arjo129]

We should have a system for reserving parking spots for robots.

This system should automatically pull parking spots from the navigation graph and keep track of (and enforce) reservations for those spots.

This could be implemented as a server where a fleet adapter sends a service request with a list (in order of highest preference) of the following information:
Parking spot name that it would like to use
When it would start using that parking spot
How long it would be at that parking spot (or nullopt if it might stay indefinitely)

Then the server responds by picking the highest priority item in the list that can be accommodated and locking that reservation in for the robot until the robot cancels its reservation.