Xiaomi Air Purifier S2 illuminance sensor support

[kirill578]

Proposed change

Add sensor illuminance sensor support xiaomi s2 air purifier. The value is capped at 200 lm. The sensor is located on the top of the device.

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)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

The sensors are based on PURIFIER_MIOT_SENSORS with an additional of (ATTR_ILLUMINANCE,). I ended up hardcoding it as I am not sure if the base sensor set will ever change and I am pretty certain there are no other sensors on the device.

• This PR fixes or closes issue: N/A
• This PR is related to issue: N/A
• Link to documentation pull request: Add Air Purifier MA2 (zhimi.airpurifier.ma2) to xiaomi_miio home-assistant.io#26489

Checklist

• 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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[home-assistant]

Hey there @rytilahti, @syssi, @starkillerOG, mind taking a look at this pull request as it has been labeled with an integration (xiaomi_miio) you are listed as a code owner for? Thanks!

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[rytilahti]

Looks straightforward to me, thanks for the PR @kirill578!

Would you mind creating a PR to the upstream, so that also the future versions of the integration will have these sensors automatically exposed? The file which requires changes is https://github.com/rytilahti/python-miio/blob/master/miio/integrations/zhimi/airpurifier/airpurifier.py#L142 and https://python-miio.readthedocs.io/en/latest/contributing.html#status-containers describes the process of adding those decorators.

edit: looks like the docs are completely missing for this device.