Global Wellness Tourism Market Size, Share & Demand Report By Service Type (Spa & Relaxation Tourism, Medical & Health Tourism, Thermal & Hot Springs Tourism, Yoga & Meditation Retreats, Fitness & Active Wellness Programs, Alternative & Traditional Medicine Tourism, Preventive & Diagnostic Wellness), By Traveler Type (Domestic Wellness Travelers, International Outbound Travelers, Inbound Medical-Wellness Travelers), By Accommodation Type, By Distribution Channel, By Region & Segment Forecasts, 2025–2030