* Add HumidifierAction StrEnum
* Add action attribute to HumidifierEntity
* Update strings.json
* Add action to demo humidifier
* Add tests
* Fix imports
* Add 'off' humidifier action
* Set action to 'off' when state is 'off'
* Add 'off' action to strings.json
* Test that action sets to "off" when state is "off"
* Use is_on instead of state
* Fix typo
* black