Next-Gen Firewall Solutions Market Size & Forecasts 2026-2035, By Segments (Enterprise Size, Deployment Type, End-User), Growth Opportunities, Innovation Landscape, Regulatory Shifts, Strategic Regional Insights (U.S., Japan, China, South Korea, UK, Germany, France), and Competitive Dynamics (Palo Alto Networks, Fortinet, Check Point Software Technologies, Cisco Systems, Juniper Networks)