help to add smart plugs
First of all, a deep thank you for making this plugin. Great effort!

Could you please add support for smart plug device types? The model I am working with right now is Gosund Smart Plug (cuco.plug.cp1); this should be supported by the MIoT protocol as per [link](https://github.com/rytilahti/python-miio/issues/627).

In fact, I have already tried to add this device to homebridge. The device discovery is fine. The state polling is fine as well. I tried to turn it on, however, that didn't work. Interestingly, I can turn it off though once being turned on manually.

Happy to provide any necessary info on my end. I'm relatively comfortable with programming (mostly python). New to homebridge though.

Your time is much appreciated. Cheers!