Smart Flow Meter Market By Type (Magnetic, Coriolis, Ultrasonic, Vortex, Multiphase, Thermal, Others (Turbine, Variable Area, and Differential Pressure)), By End User (Water and Wastewater, Power Generation, Chemicals, Food and Beverages, Oil and Gas, Others), By Communication Protocol (PROFIBUS, Modbus, HART, Others): Global Opportunity Analysis and Industry Forecast, 2021-2031