Diesel Generator Market Size, Share & COVID-19 Impact Analysis, By Power Rating (Below 75 kVA, 75-375 kVA, 375-750 kVA, Above 750 kVA), By Portability (Stationary, Portable), By Application (Continuous Load, Peak Load, Stand By Load), By End User (Mining, Oil & Gas, Construction, Residential, Marine, Manufacturing, Pharmaceuticals, Commercial, Telecom, Electric Utility, Data Centers, Others), and Regional Forecast, 2022-2029