Power Consumption Meter works only as a switch, no power readings
* **Please explain your feature request in a one or two sentences.**

I recently bought this wifi rail switch:

https://www.banggood.com/2P-63A-eWelink-Single-Phase-Din-Rail-WIFI-Smart-Switch-Energy-Meter-Leakage-Protection-Remote-Read-KWh-Meter-Wattmeter-Works-with-Alexa-Google-p-1840501.html?rmmds=myorder&cur_warehouse=CZ

which provides power consumption readings in the Ewelink app. 

The plugin in HomeBridge appears to receive the readings :

> [10/11/2022, 12:52:05 AM] [eWeLink] [Power meter 1] current power [0.00W] current voltage [234.72V] current current [0.00A].
> [10/11/2022, 12:52:06 AM] [eWeLink] [Power meter 1] current power [0W] current voltage [234.71V] current current [0A].
> [10/11/2022, 12:52:06 AM] [eWeLink] [Power meter 1] current power [0.00W] current voltage [234.72V] current current [0.00A].
> [10/11/2022, 12:52:32 AM] [eWeLink] [Power meter 1] current power [0W] current voltage [235.31V] current current [0A].

* **Is your feature request related to a problem? Please describe.**
However, there is no indication of power readings in homebridge or Home.app and the device appears as a simple outlet/switch rather than a power meter/switch. 


* **Any particular eWeLink devices that this relates to?**
SMT003


* **Anything else?**
Kind request to add support for power readings as a HomeBridge accessory.

![IMG_9606](https://user-images.githubusercontent.com/239807/194959093-e4ac3f88-c819-420d-a7c8-887d7bf4181c.PNG)
<img width="795" alt="Screenshot 2022-10-11 at 01 03 50" src="https://user-images.githubusercontent.com/239807/194959496-847bc418-4c89-4133-a39f-90eb816a4cc7.png">
