Add Linear Garage Door integration

[IceBotYT]

Proposed change

I am adding a new integration which allows users to control Linear garage doors from Home Assistant.

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)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• Link to documentation pull request: Add Linear Garage Door documentation home-assistant.io#27014
• Link to brands pull request: Add Linear Garage Door brand icons brands#4309

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
• I have followed the perfect PR recommendations
• 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.
• For the updated dependencies - a link to the changelog, or at minimum a diff between library versions is added to the PR description.
• Untested files have been added to .coveragerc.

To help with the load of incoming pull requests:

• I have reviewed two other open pull requests in this repository.

[home-assistant]

When adding new integrations, limit included platforms to a single platform. Please reduce this PR to a single platform

[home-assistant]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks 👍

Learn more about our pull request process.

[IceBotYT]

Oops, didn't mean to include both 😅

light platform removed

[Lash-L]

Here's a first pass!

I'm not a core maintainer - so don't feel like you have to listen to anything I say, but hopefully this is helpful!

[emontnemery]

I think this looks good now, just a question about the device_id which is generated by the config flow.

[emontnemery]

So the device_id is just a random string?
Is it OK that the device_id is reset during reauth?

Also, there's another "device_id" used to build entity unique_id, could you give this one a different name so it's clearer which is which?

[IceBotYT]

Sure, the device_id generated by the config flow is the ID of the device making the request (Home Assistant). It serves no purpose other than to identify Home Assistant to Linear's servers. The device_id in the cover entity is the device ID of the garage door opener itself.

[emontnemery]

Thanks, @IceBotYT 👍

Stale

[IceBotYT]

Should I update the branch too? I don't have access to my computer at the moment so should I just use the update branch with rebase button?

[edenhaus]

Please make sure CI is passing