Basically when someone requests a new car, getting that car ready takes
some time, this means that during the waiting period, that person is
still driving its old car.
This commit adds a field future_driver_id on fleet.vehicle to tackle
that problem and a boolean plan_to_change_car on the partner to track
who wants to change car.
+ Apply some linting to the files
This commit cleans the vehicle form view, the vehicle contract form
view, the cost list view and adds a manager_id field on the
vehicle.model which is then used as a related on the vehicle.
Task: 1930298
closesodoo/odoo#31197
Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>