Add api pt_objects

API pt_objets with a possibility to querry on network, commercial_mode, stop_area, line and route.
i don't understand type_filter has route in this example too no ?

maybe It would be clearer with a new list at each test (you can use initializer_list for that: eg {navitia::type::Type_e::Network, navitia::type::Type_e::CommercialMode, ...}