New device: xiaomi.wifispeaker.v3 小米互联网音箱

[PRO-2684]

Device information:

• Name(s) of the device: 小米互联网音箱
• Link: https://www.mi.com/wifispeaker
• Model: xiaomi.wifispeaker.v3
• Hardware version: Linux
• Firmware version: 1.19.112

Additional context
Volume can be changed via Mijia app.