New Yorkers will stand in line for anything — cronuts, cold plunges, chaos — so naturally, the city’s walking tours have officially gone off the rails in the best possible way. Forget the basic Statue of Liberty selfie circuit. Across the five boroughs, tourists and locals alike are shelling out to stalk celebrity hotspots, descend into candlelit catacombs, chase Broadway ghosts and even learn the intimate sex lives of rats. From mobsters and Marvel heroes to bodega cats and glazed doughnuts,