[Feature request] add image of car as icon to device_tracker

[sonar98]

In the Skodaconnect version the device_tracker icon shows the image that is available from the API.

I think this part of the code in the init.py is getting this image:
`

    if "position" in self.attribute:
        # Try to use small thumbnail first hand, else fallback to fullsize
        if self.vehicle.is_model_image_small_supported:
            attributes["entity_picture"] = self.vehicle.model_image_small
        elif self.vehicle.is_model_image_large_supported:
            attributes["entity_picture"] = self.vehicle.model_image_large

    return attributes

`