Calcined Petcoke Market Size & Forecasts 2026-2035, By Segments (Grade, Application), Growth Opportunities, Innovation Landscape, Regulatory Shifts, Strategic Regional Insights (U.S., Japan, China, South Korea, UK, Germany, France), and Competitive Dynamics (Jiangsu Eastern Heavy Industry, Companhia Brasileira de Metalurgia e Mineração, Shandong Lanhai New Material, Guangdong Huaxing Coking, Coromandel International)