Support for multiple devices

[TristanBrotherton]

Thank you so much for your work on this plugin.

I have a weather station with multiple temperature sensors. I was able to create a mapping using "category": "wsdcg", to showcase the first (ToutCh1) temp sensor with the following JSON but the additional sensors are not displayed. A work-around would be to be able to add as multiple devices, but that did not seem to be possible.

{
    "name": "Tuya",
    "options": {
        "projectType": "2",
        "endpoint": "https://openapi.tuyaus.com",
        "accessId": "",
        "accessKey": "",
        "countryCode": 1,
        "username": "",
        "password": "",
        "appSchema": "tuyaSmart",
        "deviceOverrides": [
            {
                "id": "",
                "category": "wsdcg",
                "unbridged": false,
                "schema": [
                    {
                        "code": "ToutCh1",
                        "newCode": "va_temperature",
                    },
                    {
                        "code": "HoutCh1",
                        "newCode": "humidity_value",
                    },
                    {
                        "code": "ToutCh2",
                        "newCode": "va_temperature",
                    },
                    {
                        "code": "HoutCh2",
                        "newCode": "humidity_value",
                    },
                    {
                        "code": "ToutCh3",
                        "newCode": "va_temperature",
                    },
                    {
                        "code": "HoutCh3",
                        "newCode": "humidity_value",
                    }
                ]
            }
        ],
        "debug": false
    },
    "platform": "TuyaPlatform"
}

[TristanBrotherton]

Seemed easier to just add support for weather stations, so I did that with #495