Coin Collecting Market Size & Forecasts 2026-2035, By Segments (Distribution Channel, Design, End User, Product Type, Metal Type), Growth Opportunities, Innovation Landscape, Regulatory Shifts, Strategic Regional Insights (U.S., Japan, China, South Korea, UK, Germany, France), and Competitive Dynamics (Heritage Auctions, Stack’s Bowers Galleries, Coin World, David Lawrence Rare Coins, GreatCollections)