Sustainable Powertrain Materials Market Size, Share, and Industry Analysis by Material Category (Metals, Polymers & Elastomers, Composites, Ceramics & Functional Materials, and Electrochemical & Catalyst Materials), Internal Combustion Engine (ICE) (incl. mild-hybridized ICE), & (Battery System, E-Motor & E-Drive, Power Electronics, and Transmission), By Sustainability Pathway (Recycled-Content Materials, Low-Carbon Primary Materials, Critical-Mineral Reduced/Substituted Materials, and Bio-Based / Biodegradable Materials), and Regional Forecast 2026-2034