Autodiscovery MQTT request add battery in to main subject.

[PVerburg]

Hi running zigbee2mqtt autodiscovery works great a job well done!
I have a feature request, I use door/window sensors some of these wont be triggered for days/weeks so last seen is "old" but the sensors do report battery status at least once a day so could you please Add the battery status report to the last seen as the sensor is seen. So we know that the sensor is working correctly and the status is still valid, as the switch status is available in the same transmission as the battery status.

Thanks,

Paul V.