Add roomba support for automatic emptying

[thomaspurchas]

Proposed change

Roomba i7+ and s9+ are capable of auto emptying, and will set their phase to evac when doing so. This adds a state mapping from evac to STATE_CLEANING so that the correct data ends up in home assistant. Previously this state would map to STATE_ERROR.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

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• The code change is tested and works locally.
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• Tests have been added to verify that the new code works.

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• Documentation added/updated for www.home-assistant.io

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[probot-home-assistant]

Hey there @pschmitt, @cyr-ius, @shenxn, mind taking a look at this pull request as its been labeled with an integration (roomba) you are listed as a codeowner for? Thanks!
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[shenxn]

Fixing the flake8 check and it should be good to go. Also, I think STATE_RETURNING might be better than STATE_CLEANING in representing the state.

[shenxn]

Suggested change

	"evac": STATE_CLEANING, # Emptying at cleanbase
	"evac": STATE_RETURNING, # Emptying at cleanbase

[stale]

There hasn't been any activity on this pull request recently. This pull request has been automatically marked as stale because of that and will be closed if no further activity occurs within 7 days.
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