Automotive Spark Plugs and Glow Plugs Market Size & Forecasts 2026-2035, By Segments (Vehicle Type, Spark Plug Type, Aftertreatment System, Technology, Fuel Type), Growth Opportunities, Innovation Landscape, Regulatory Shifts, Strategic Regional Insights (U.S., Japan, China, South Korea, UK, Germany, France), and Competitive Dynamics (NGK, Denso, Bosch, Champion, Delphi Technologies)