Gas Water Tube Industrial Boiler Market Size & Forecasts 2026-2035, By Segments (Capacity, Application, Technology), Growth Opportunities, Innovation Landscape, Regulatory Shifts, Strategic Regional Insights (U.S., Japan, China, South Korea, UK, Germany, France), and Competitive Dynamics (Bosch, Cleaver-Brooks, Hurst Boiler, Babcock & Wilcox, Mitsubishi Heavy Industries)