Opioids Market Segmentation by Product Type (Codeine, Fentanyl, Methadone, Oxycodone, Morphine, and Hydrocodone); by Application (Pain Management, Cough Treatment, and Diarrhea Treatment); and by Receptor Binding (Strong Agonist, and Mild to Moderate Agonist) – Global Demand Analysis & Opportunity Outlook 2031