Require explicit feature type (#1006)

Explicit > implicit. Having this previously would have avoided using a
wrong type for water_alert in the first place.

kasa/smart/modules/humiditysensor.py

@@ -29,6 +29,7 @@ class HumiditySensor(SmartModule):
                 icon="mdi:water-percent",
                 unit="%",
                 category=Feature.Category.Primary,
+                type=Feature.Type.Sensor,
             )
         )
         self._add_feature(