Add state_class and use SensorEntityDescription for comfoconnect (#54066)

* Add state_class=measurement and use SensorEntityDescriptions

* Use attributes from entity_description

* Improvements

* Adress remarks

* Revert changes to fan

* move method

* Fix tests

* Revert fan/__init__.py

* Revert key change

* Set default percentage in turn_on

homeassistant/components/comfoconnect/__init__.py

@@ -90,7 +90,6 @@ class ComfoConnectBridge:
 
     def __init__(self, hass, bridge, name, token, friendly_name, pin):
         """Initialize the ComfoConnect bridge."""
-        self.data = {}
         self.name = name
         self.hass = hass
         self.unique_id = bridge.uuid.hex()