Add color setting trait

[balloob]

Description:

Add the new color setting trait, which merges the color spectrum and color temperature trait into 1.

Related issue (if applicable): fixes #22675

Pull request in home-assistant.io with documentation (if applicable): home-assistant/home-assistant.io#<home-assistant.io PR number goes here>

Example entry for configuration.yaml (if applicable):

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.

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

• Documentation added/updated in home-assistant.io

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

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• New files were added to .coveragerc.

If the code does not interact with devices:

• Tests have been added to verify that the new code works.

[OttoWinter]

Might have missed a previous conversation about this, but: Why don't we use HSV here? I mean we use HSV ourselves internally.

[balloob]

So right now I just migrated it. I glanced at it briefly, but I have to confess that I don't know how to convert our HS_COLOR attribute to HSV. If it's a simple fix and you know how to convert it, it's as simple as a dict having hue, saturation and value: https://developers.google.com/actions/smarthome/traits/colorsetting#device-states , and then in execute also be able to deal with incoming spectrumHSV attribute.

[codecov]

Codecov Report

Merging #22894 into dev will decrease coverage by 0.01%.
The diff coverage is 97.43%.

@@            Coverage Diff             @@
##              dev   #22894      +/-   ##
==========================================
- Coverage   93.83%   93.82%   -0.02%     
==========================================
  Files         448      448              
  Lines       36574    36525      -49     
==========================================
- Hits        34321    34271      -50     
- Misses       2253     2254       +1

Impacted Files	Coverage Δ
homeassistant/components/google_assistant/trait.py	96.1% <97.43%> (-0.27%)	⬇️
homeassistant/components/mqtt/climate.py	99.43% <0%> (-0.07%)	⬇️
homeassistant/components/mqtt/binary_sensor.py	100% <0%> (ø)	⬆️
homeassistant/components/mqtt/vacuum.py	92.46% <0%> (ø)	⬆️
homeassistant/components/mqtt/sensor.py	100% <0%> (ø)	⬆️
homeassistant/components/mqtt/cover.py	94.07% <0%> (ø)	⬆️
homeassistant/components/hassio/ingress.py	71.3% <0%> (ø)	⬆️
...meassistant/components/mqtt/alarm_control_panel.py	99.26% <0%> (ø)	⬆️

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