Add support for Xiaomi Tower Fan (dmaker.fan.p39)

Xiaomi’s Smart Tower Fan is called dmaker.fan.p39 in the latest generation.
The integration has support for other dmaker.fans but this one is missing.
It has a 1-100 speed regulation, rotation, ‘natural/breeze’ airflow, beep control, child lock.
The existing P9 integration has almost the same, except it doesn’t have the ‘natural/breeze’ switch.

This custom integration allows the device to be added, but it currently doesn’t work for all: GitHub - syssi/xiaomi_fan: Xiaomi Mi Smart Fan integration for Home Assistant

Yes, I did try with that previously, and it works fine with my old Smart Fan 2S, but not the new Smart Tower Fan, I’ve just created a case for it…