Add more sensors to HomeAssistant autodiscovery

[Sboshoff76]

Apologies if this is not the correct way to do this, it's my first time.

Adding additional energy and power sensors

[celsworth]

Thanks, I think this looks fine. I was a bit surprised that p_rec is "AC Charging" only but the modbus register agrees (though it calls it "Rectified" as well, maybe we want that in the description but not really a bit deal).