Protein Supplements Market Size, Share & Industry Analysis, By Source (Plant-Based {Soy, Rice, Wheat, and Others}, Animal-Based {Whey, Casein, Egg, and Others}, and Others), By Product (Protein Powder, RTD, Protein Bars, and Others), By Functionality (Performance and Recovery, Weight Management, General Health and Well-being, Medical Nutrition, and Others), By Distribution Channel (Supermarkets and Hypermarkets, Pharmacies/Drug Stores, Online Retail, and Others), and Regional Forecast, 2026-2034