Don't override methods marked as final

[cdce8p]

Proposed change

Preview for the next pylint version which adds a new check overridden-final-method to detect methods that override a method decorated with @final.

For Home Assistant there are a few integrations which overwrite the state method at the moment.

Pylint PR which added the check: pylint-dev/pylint#5133

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[cdce8p]

I'm not quite sure what to do with this one. The base class for Alert -> ToogleEntity already provides a state method. That one however will only return STATE_OFF or STATE_ON depending on self.is_on. Thus by removing this method, we would loose STATE_IDLE.

[frenck]

The alert integration can use some love, let's keep that out the scope for this PR 👍