Noxdk/device registry

[lunds]

@noxdk made a great addition to make the device show up as a fully-fledged device in HA.
This makes it so much easier to find in the config pages. I merely fixed a merge-conflict on unique-id.

I suggest we join forces here in @dkjonas's original repo, hence this PR :-)

[jascdk]

@noxdk Hi:) Great additions you have made to the AHC integration:) If you use Home Assistant - I can strongly recommend this repo also https://github.com/heinekmadsen/esphome_components - it implements the AHC controller into esphome :) If you have the time - I have thought about making some additions to the ESPHOME code to utilize the "lock mode" as a switch - but I have some trouble figuring out how the modbus works on this unit. The author of the ESPHOME integration does not have so much time right now digging into it - can you help?