Add NovaDigital T20A (#5682)

Added smartplug NovaDigital T20A model

custom_components/tuya_local/devices/smartplugv2_energyv3.yaml

@@ -19,6 +19,9 @@ products:
   - id: 74xo1nolwa6xkjeu
     manufacturer: Arlec
     model: PC191HA Series 4
+  - id: keykmm3rjyqy5r8p
+    manufacturer: NovaDigital
+    model: T20A
 entities:
   - entity: switch
     class: outlet