Add target_humidity_step attribute to humidifier

[LG-ThinQ-Integration]

Proposed change

Add attribute "target_humidity_step" to humidifier for customize step in frontend.
It was discussed that this attribute is necessary to apply LG-based humidifiers. #152593 (comment)

• core: Add attr_target_humidity_step to humidifier entity.
• frontend: Additionally, attribute is required to the step function of the humidifier control.

private get _step() { return this.stateObj.attributes.target_humidity_step ?? 1; }

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

• This PR fixes or closes issue: fixes #
• This PR is related to issue: Add humidifier entity for humidifier and dehumidifier to LG ThinQ  #152593
• Link to documentation pull request:
• Link to developer documentation pull request: Add target_humidity_step to humidifier developers.home-assistant#2865
• Link to frontend pull request: Add target_humidity_step to humidifier frontend#28005

Checklist

• I understand the code I am submitting and can explain how it works.
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• Tests have been added to verify that the new code works.
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[home-assistant]

Hey there @home-assistant/core, mind taking a look at this pull request as it has been labeled with an integration (demo) you are listed as a code owner for? Thanks!

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[home-assistant]

Hey there @home-assistant/core, @Shulyaka, mind taking a look at this pull request as it has been labeled with an integration (humidifier) you are listed as a code owner for? Thanks!

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[frenck]

Oh hi there @LG-ThinQ-Integration 👋

Thanks for opening a pull request. However, this PR changes a core base entity component. Changes to these require an architectural discussion which has been approved.

I wasn't able to locate the architectural proposal for this one, can you please point me to it?

Thanks! 👍

../Frenck

                       

Blogging my personal ramblings at frenck.dev

[home-assistant]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks 👍

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[LG-ThinQ-Integration]

@frenck
Discussion: home-assistant/architecture#1309