Metal Gear Component Market Size, Share, and Industry Analysis, By Gear Type (Spur Gears, Helical Gears, Bevel Gears, Worm Gears, Rack and Pinion Gears, and Planetary Gears), By Material (Steel, Cast Iron, Brass, and Bronze, Aluminum, and Others), By Application (Gearboxes, Transmission, Motor and Drives, Differentials, Actuators, and Robotics Systems), By End User (Automotive, Industrial Machinery, Aerospace & Defense, Energy & Power, Construction & Mining, and Marine), and Regional Forecast, 2026-2034