Lavatory Service Vehicle Market Size, Share & Industry Analysis, By Type (Trucks, Trailer-Mounted, and Carts), By Propulsion (Conventional Fuels (Petrol, Gasoline, and Diesel), Electric, and Hybrid), By Capacity (Light (Up to 190 liters), Medium (190 to 380 Liters), and Heavy (More than 380 Liters)), By End User (Commercial Airlines, Military and Defense, and Private Jets), and Regional Forecast, 2026-2034