Global Software-Defined Networking (SDN) Market by Component (SDN Infrastructure, Software, and Services), Type of SDN, Application (SD-WAN, SD-LAN, Security, and Others), End User (Telecom Service Providers, Cloud Service Providers, and Enterprises), Organization Size, Vertical (BFSI, Education, Government & Defense, Healthcare, Manufacturing, Retail & E-commerce, Telecom & IT, and Others), Geographical Regions, and Key Players - Trends and Forecast 2026-2040