Ignore Tasmota accessory if already configured

[mdaskalov]

Describe The Bug:
Homebridge fails to start if a tasmota device is configured twice with the same topic and type

Expected behavior:
Check if already configured and ignore if so.

Logs:

[28/04/2024, 12:41:44] [homebridge-tasmota-zbbridge] This plugin threw an error from the characteristic 'On': Unhandled error thrown inside read handler for characteristic: This callback function has already been called by someone else; it can only be called one time.. See https://homebridge.io/w/JtMGR for more info.

Plugin Config:

        {
            "topic": "topic",
            "type": "LIGHT",
            "name": "Light1"
        },
        {
            "topic": "topic",
            "type": "LIGHT",
            "name": "Light2"
        },