Add support for Mi Scale 1&2

[devbis]

Sample parsing:

https://github.com/lolouk44/xiaomi_mi_scale/blob/master/src/Xiaomi_Scale.py https://github.com/custom-components/ble_monitor/blob/master/custom_components/ble_monitor/ble_parser/miscale.py

[khongpt]

I hope this requirement will be considered for this device. I also have one myself. Looking forward to it!