Functional Sugar Market Size, Share & Industry Analysis, By Type (GOS, FOS/Oligofructose, Allulose, and Lactulose), By Function (Prebiotic & Digestive Health, Low-Calorie Sweetening, and Pharmaceutical Functionality), By Form (Dry Powder, Liquid Concentrates, and Granules/Flakes), By Source (Dairy-Derived, Corn/Starch-Derived, and Sugar Beet/Sugarcane-Derived), By Processing Technology (Enzymatic Conversion, Hybrid Processing, and Extraction & Purification), By Application (Food & Beverages, Infant Nutrition, and Dietary Supplements & Nutraceuticals), and Regional Forecast, 2026-2034