Include serial number in HomeKit device info (#114688)

Very useful when adding a hub that has many identical devices already paired

homeassistant/components/homekit_controller/connection.py

@@ -384,6 +384,7 @@ class HKDevice:
             model=accessory.model,
             sw_version=accessory.firmware_revision,
             hw_version=accessory.hardware_revision,
+            serial_number=accessory.serial_number,
         )
 
         if accessory.aid != 1: