Return color information in Alexa Smart Home response

[jackwilsdon]

Description: Return color information in Alexa Smart Home response

This PR adds the color attribute for the Alexa.ColorController interface in the response, fixing an error that occurs within Alexa when setting the color of a device.

Related issue (if applicable): fixes #18367

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:

• New dependencies have been added to the REQUIREMENTS variable (example).
• New dependencies are only imported inside functions that use them (example).
• New or updated dependencies have been added to requirements_all.txt by running script/gen_requirements_all.py.
• 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.

[balloob]

Nice!