Add support for Soundcore P31

[doitintheroad]

Device Model
Soundcore P31

State Update Packet
Some(Packet { command: Command([1, 1]), body: [1, 1, 9, 9, 0, 0, 48, 49, 46, 56, 51, 48, 49, 46, 56, 51, 49, 50, 48, 50, 51, 52, 48, 57, 67, 57, 66, 52, 48, 51, 67, 69, 48, 49, 46, 56, 51, 3, 0, 0, 120, 120, 120, 120, 120, 120, 120, 120, 120, 120, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 0, 0, 0, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 0, 0, 10, 255, 255, 99, 102, 255, 255, 68, 68, 51, 0, 80, 0, 0, 0, 0, 0, 0, 50, 1, 1, 0, 1, 1, 2, 0, 90, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 255, 255, 255, 255] })

[doitintheroad]

Thanks - you are awesome!

[ShyMaster202]

Interestingly, my P31i works when adding it to the app as the Soundcore P40i, just that some P40i features that don't exist on the P31i in the official Soundcore app don't work