Added support for milight single 1CH dimmer (limitlessLED)

[rubenverhoef]

Description:

Add support for a 1CH (MiLight) LED dimmer see happyleavesaoc/python-limitlessled#27 and happyleavesaoc/python-limitlessled#33

Related issue (if applicable): fixes #8521, fixes #11073, fixes #11121
I think this should fix this issue mentioned in the forum: https://community.home-assistant.io/t/milight-wifi-controller-ibox-2-with-led-stripe/28945

Pull request in home-assistant.github.io with documentation (if applicable): home-assistant/home-assistant.io#4718

Example entry for configuration.yaml (if applicable):

    bridges:
      - host: 192.168.0.42
        groups:
        - number: 1
          name: Kitchen
          type: dimmer

Checklist:

• The code change is tested and works locally.

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

• Documentation added/updated in home-assistant.github.io

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

• Local tests with tox run successfully. Your PR cannot be merged unless tests pass
• New dependencies have been added to the REQUIREMENTS variable (example).
• New dependencies are only imported inside functions that use them (example).
• New 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:

• Local tests with tox run successfully. Your PR cannot be merged unless tests pass
• Tests have been added to verify that the new code works.

[homeassistant]

Hi @rubenverhoef,

It seems you haven't yet signed a CLA. Please do so here.

Once you do that we will be able to review and accept this pull request.

Thanks!

[amelchio]

Welcome :-). As this limitlessled update also has fixes for a number of issues reported for HA, I have added the issue numbers to your description.

[amelchio]

Looks good 👍