U.S. Genetic Testing Market Size, Share, Trends & COVID-19 Impact Analysis, By Technique (PCR, DNA Sequencing, Microarrays, and Others), By Application (Cardiology, Oncology, Pharmacogenomics, Cognitive Dysfunction, Pathogenomics, and Others), By Payer (Public Health Insurance, Private Health Insurance, and Out-of-Pocket), By End-User (Hospitals, and Independent Laboratories) & Forecast, 2020-2027