Add support for Gosund Dimmer SW2

[jcconnell]

Adds support for the Gosund SW2 Dimmer switch.

Tuyas API Explorer output:

Device details:

{
  "result": {
    "active_time": 1736548924,
    "bind_space_id": "xxx",
    "category": "dj",
    "create_time": 1588141247,
    "custom_name": "Light",
    "icon": "smart/icon/ay1517974017716dABhC/8d518c970a152a978d8c3513bfcdb5bb.png",
    "id": "xxx",
    "ip": "xxx",
    "is_online": true,
    "lat": "xxx",
    "local_key": "xxx",
    "lon": "xxx",
    "model": "",
    "name": "SW2 2",
    "product_id": "qcgkaqmaivuwfwz4",
    "product_name": "SW2-AR",
    "sub": false,
    "time_zone": "-10:00",
    "update_time": 1736548926,
    "uuid": "xxx"
  },
  "success": true,
  "t": 1737243160296,
  "tid": "xxx"
}

Properties:

{
  "result": {
    "properties": [
      {
        "code": "led_switch",
        "custom_name": "",
        "dp_id": 1,
        "name": "",
        "time": 1737241202185,
        "type": "bool",
        "value": true
      },
      {
        "code": "bright_value",
        "custom_name": "",
        "dp_id": 3,
        "name": "",
        "time": 1737182288352,
        "type": "value",
        "value": 167
      },
      {
        "code": "temp_alarm",
        "custom_name": "",
        "dp_id": 101,
        "name": "",
        "time": 1736548932942,
        "type": "bool",
        "value": false
      }
    ]
  },
  "success": true,
  "t": 1737243283469,
  "tid": "xxx"
}

Instruction set

{
  "result": {
    "category": "dj",
    "functions": [
      {
        "code": "switch_led",
        "desc": "switch led",
        "name": "switch led",
        "type": "Boolean",
        "values": "{}"
      },
      {
        "code": "bright_value",
        "desc": "bright value",
        "name": "bright value",
        "type": "Integer",
        "values": "{\"min\":25,\"scale\":0,\"unit\":\"\",\"max\":255,\"step\":1}"
      }
    ]
  },
  "success": true,
  "t": 1737243342447,
  "tid": "xxx"
}