Missing ParkingSlot/spot type in osi3::StationaryObject::Classification

[yonivai]

Describe the feature

We didn't find an appropriate representation in OSI3 for a parking spot for parking lot scenario.
after discussing with @PhRosenberger , we think that osi3::StationaryObject is a good representation for it.
unfortunately, we didn't find a type for parkingSlot in osi3::StationaryObject::Classification.

Describe the solution you would like

we would like to add a 19th Enum type to osi3::StationaryObject::Classification - "TYPE_PARKING_SPOT".

Describe alternatives you have considered

N/A

Describe the backwards compatibility

N/A

Additional context

https://opensimulationinterface.github.io/open-simulation-interface/structosi3_1_1StationaryObject_1_1Classification.html#ad497488a7119617633b54181ea08457d