Spout Packaging Market Size & Forecasts 2026-2035, By Segments (Component, Closure Type, Material, Pouch Size, End User), Growth Opportunities, Innovation Landscape, Regulatory Shifts, Strategic Regional Insights (U.S., Japan, China, South Korea, UK, Germany, France), and Competitive Dynamics (Amcor, Berry Global, Sealed Air, Astrapak, ALPLA)