Add support Intelligent single plug(giot.plug.v6shsm )

[qjrxsoft02]

from custom_components.xiaomi_gateway3.core.devices import *

DEVICES = [{
# https://home.miot-spec.com/spec?type=urn:miot-spec-v2:device:outlet:0000A002:giot-v6shsm:1:0000D030
    16415: ["YuTai", "Intelligent single plug", "V6", "giot.plug.v6shsm"],
    "spec": [
        BaseConv("switch", "switch", mi="2.p.1"),
        BaseConv("inchingswitch", "switch", mi="6.p.1"),
        MapConv("power_on_state", "select", mi="2.p.5", map={0: "Off", 1: "On", 2: "Default"}),  # config
    ],
}] + DEVICES

[wangyz1997]

Done in #1518.

[AlexxIT]

https://github.com/AlexxIT/XiaomiGateway3/releases/tag/v4.0.8