feat (meaco_aretetwo_dehumidifier): add 18L variant

Since the report only lists a single dp, this will have to match by product_id
only (possibly the device needs to be on to report full info).

Issue #4224

custom_components/tuya_local/devices/meaco_aretetwo_dehumidifier.yaml

@@ -3,6 +3,9 @@ products:
   - id: hrqj115cek0tuddi
     manufacturer: MeacoDry
     model: Arete Two 10L
+  - id: i3uw9kkmagpdikvo
+    manufacturer: MeacoDry
+    model: Arete Two 18L
 entities:
   - entity: humidifier
     class: dehumidifier