Add Tuya light platform

[huangyupeng]

Description:

Add support for Tuya light. After configuring username and password and country code in Tuya component, home assistant can discover supported devices which related to user's Tuya account and control them through Tuya cloud service.

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

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass

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:

• 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.

[MartinHjelmare]

Looks good. Two small comments.

[MartinHjelmare]

Please use string formatting.

return 'tuya.{}'.format(self.tuya.object_id())

[MartinHjelmare]

Please sort 🔡.

[huangyupeng]

@MartinHjelmare
Last time, you said that I should use icon property. But I found that when return the URL, the icon doesn't work. So, maybe I should use entity_picture property?

[MartinHjelmare]

Yeah, that looks good. I missed that it was a url.

[MartinHjelmare]

Make sure to add a docs PR.

[frenck]

@MartinHjelmare Please do not merge when you think or know the documentation is missing.

[MartinHjelmare]

Yes, I missed to check this time.

[gsalvati]

Dears, I updated to HA 0.74.2 and enabled Tuya component for my account.
But I have 3 window switch and I want to know how to enable it on HA interface? There is 3 position in the Window (blind) Switch (UP, OFF, DOWN), its more like 2 way light switch.
Any help?

[gsalvati]

@huangyupeng can you add "cover" support por Tuya Smart?

[MartinHjelmare]

Feature and enhancement requests should go in the Feature Requests section of our community forum. Thanks!