Add support for hmi208(xiaomi plug BLE) (#39306)
Add support for hmi208(xiaomi plug BLE) (#39306)

As this plug has already been supported in [python-miio v5.1](https://github.com/rytilahti/python-miio/releases/tag/0.5.1).
Changes towards xiaomi-miio made for fully supporting this device in HA.
turbokongen/home-assistant,home-assistant/home-assistant,nkgilley/home-assistant,tboyce1/home-assistant,partofthething/home-assistant,adrienbrault/home-assistant,w1ll1am23/home-assistant,GenericStudent/home-assistant,partofthething/home-assistant,Danielhiversen/home-assistant,tboyce1/home-assistant,tchellomello/home-assistant,sdague/home-assistant,rohitranjan1991/home-assistant,balloob/home-assistant,lukas-hetzenecker/home-assistant,balloob/home-assistant,tboyce1/home-assistant,mezz64/home-assistant,w1ll1am23/home-assistant,toddeye/home-assistant,soldag/home-assistant,Danielhiversen/home-assistant,nkgilley/home-assistant,FreekingDean/home-assistant,FreekingDean/home-assistant,mezz64/home-assistant,sander76/home-assistant,jawilson/home-assistant,adrienbrault/home-assistant,toddeye/home-assistant,rohitranjan1991/home-assistant,tboyce021/home-assistant,aronsky/home-assistant,turbokongen/home-assistant,sander76/home-assistant,soldag/home-assistant,rohitranjan1991/home-assistant,sdague/home-assistant,kennedyshead/home-assistant,aronsky/home-assistant,kennedyshead/home-assistant,GenericStudent/home-assistant,tboyce021/home-assistant,balloob/home-assistant,home-assistant/home-assistant,tboyce1/home-assistant,tchellomello/home-assistant,jawilson/home-assistant,lukas-hetzenecker/home-assistant