Protein Bar Market Size, Share & Trends Analysis Report by Sources (Plant-Based, Animal-Based), by Types (Sports Nutrition Bars, Meal Replacement Bars, Other Types), by Distribution Channels (Mass Merchandisers, Specialty Stores, Convenience Stores, Online Channels), by Region (North America, Europe, Asia Pacific, Latin America) - Global Industry Assessment (2016 - 2021) & Forecast (2022 - 2028)