feat(reiga_ceiling_fan): add compatible Mercator model

DPS layout and ranges is identical, and the branding even includes
"Casa" which was given as an alternative brand for the original model.

Closes PR #3379

custom_components/tuya_local/devices/reiga_ceiling_fan.yaml

@@ -3,6 +3,9 @@ products:
   - id: aktxh7558udrex8a
     manufacturer: CasaFan / Reiga
     model: Eco Genuino
+  - id: ggcvdl5nydg5qqtr
+    manufacturer: Mercator Ikuu
+    model: Casa DC Ceiling Fan
 entities:
   - entity: fan
     translation_only_key: fan_with_presets