Add humidity mode
![IMG_0D7FDEF0D123-1](https://user-images.githubusercontent.com/13917662/152528386-3001150f-0660-4dd9-adb4-fecb946a38a1.jpeg)

Currently my humidifier has a humidity mode.
It seems that this function does not exist in the corresponding plug-in, and it seems that there is only an On/Off function.

Could you please add that feature?

thank you.

![IMG_87405703274B-1](https://user-images.githubusercontent.com/13917662/152528538-ae94c776-5bf5-46c1-82e0-c2773a8b787c.jpeg)
(Other plugins look like this.)