Add support for yeelink.light.mono4
Added through plugin auto discovery.
Forced micloud and still wasn't able to turn on/off the light.

I got a ```no response``` in Homekit and the following in HB -D
```
[07/11/2021, 10:41:39] [miot] [Porch Left] Error: Could not connect to device, token might be wrong
[07/11/2021, 10:41:39] [miot] [Porch Left] Could not connect to the device! Retrying in 42 seconds!
```
I assume this is normal since it wasn't implemented in the plugin.

I believe this should be the [spec](https://miot-spec.org/miot-spec-v2/instance?type=urn:miot-spec-v2:device:light:0000A001:yeelink-mono4:1) for it
