Air conditioner 0.5 step value for cooling temp
Hi, thank you for this great plugin. My air conditioner's cooling temperature can be set by 0.5 degrees. (18, 18.5, 19, 19.5 and so on) The setting to choose between 0.5 step and 1 step is in the ThinQ app. Is it possible to implement this?

For reference the model is WINF_056905_WW (which got supported few days ago)
and the log when I set the temp to 24.5 celcius in ThinQ app:
```
[6/15/2022, 5:48:10 PM] [LGThinQ] [에어컨] Received snapshot:  {"airState.tempState.target":24.5,"meta":{"allDeviceInfoUpdate":false,"messageId":"qkn3DGMNS-iRpwSBGczkBQ"},"mid":200647939,"online":true,"static":{"countryCode":"KR","deviceType":"401"},"timestamp":1655282889993}
[6/15/2022, 5:48:10 PM] [LGThinQ] mqtt message received: {"data":{"state":{"reported":{"airState.tempState.target":24.5,"meta":{"allDeviceInfoUpdate":false,"messageId":"qkn3DGMNS-iRpwSBGczkBQ"},"mid":200647939,"online":true,"static":{"countryCode":"KR","deviceType":"401"},"timestamp":1655282889993}}},"deviceId":"6a5cf5d9-486f-135e-b472-4cbad7f4e5ba","type":"monitoring"}
```

And when it's set to 24.5 celcius, in home app it's rounded up to 25 celcius.
