Global Neurodegenerative Drugs Market Size, Share & Trends Analysis Report, By Type (Selective Serotonin Reuptake Inhibitors (SSRIs), N-Methyl-D-Aspartic Acid (NMDA), Dopamine Inhibitors, and Others), By Indication (Alzheimer’s Disease, Parkinson’s Disease, Multiple Sclerosis, Spinal Muscular Atrophy, and Others), Forecast (2022-2028)