Add support for Daikin options to set temperature by 0.5 steps

[fredrike]

Breaking change

Proposed change

Some (but not all) Daikin units supports Target Temp in 0.5 steps, this adds an option for setting that.

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

Example entry for configuration.yaml:

# Example configuration.yaml

Additional information

• This PR fixes or closes issue: fixes Support steps of 0.5 for Daikin AC #35414
• This PR is related to issue: Add config options to Daikin and add support for Daikin zeroconf discovery #35507
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• The code has been formatted using Black (black --fast homeassistant tests)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

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

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• Untested files have been added to .coveragerc.

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[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.
Thank you for your contributions.

[frenck]

@fredrike This PR has some merge conflicts. Could you resolve those?

[fredrike]

I was under the impression that this shouldn't be merged..

#35414 (comment)

[frenck]

Aah right, lets close it up until that discussion has been resolved 👍