GaN Substrate Market Size, Share & Industry Analysis, By Substrate Type (GaN-on-Silicon Carbide, GaN-on-Silicon, GaN-on-Sapphire, and Bulk GaN), By Wafer Size (2-inch, 4-inch, 6-inch, and 8-inch and Above), By Application (RF Devices, Power Electronics, Optoelectronics, and Others), By End-use Industry (Telecommunications, Aerospace & Defense, Automotive, Consumer Electronics, Healthcare, and Others), and Regional Forecast, 2026 – 2034