Add RPC smoke binary sensor to Shelly integration (#85697)

* Add RPS smoke binary sensor

* Remove index

* Remove the unnecessary attribute

homeassistant/components/shelly/binary_sensor.py

@@ -190,6 +190,12 @@ RPC_SENSORS: Final = {
         entity_category=EntityCategory.DIAGNOSTIC,
         supported=lambda status: status.get("apower") is not None,
     ),
+    "smoke": RpcBinarySensorDescription(
+        key="smoke",
+        sub_key="alarm",
+        name="Smoke",
+        device_class=BinarySensorDeviceClass.SMOKE,
+    ),
 }