Self-Cleaning Facade Coatings Market Size & Forecasts 2026-2035, By Segments (Distribution Channel, Coating, End Use, Product Type, Surface Type), Growth Opportunities, Innovation Landscape, Regulatory Shifts, Strategic Regional Insights (U.S., Japan, China, South Korea, UK, Germany, France), and Competitive Dynamics (AkzoNobel, PPG Industries, Sherwin-Williams, Jotun, Hempel)