Allergic Rhinitis Drugs Market Size & Forecasts 2026-2035, By Segments (Disease Type, Drug Type, Age Group, Distribution Channel, Route of Administration, Treatment Type), Growth Opportunities, Innovation Landscape, Regulatory Shifts, Strategic Regional Insights (U.S., Japan, China, South Korea, UK, Germany, France), and Competitive Dynamics (GlaxoSmithKline, Sanofi, Merck, Novartis, Johnson & Johnson)