Use sub-devices for Shelly multi-channel devices

[bieniu]

Breaking change

Proposed change

Tested devices:

• [ ] Shelly 1
• [ ] Shelly 1PM
• [ ] Shelly 1PM Gen3
• [ ] Shelly 2.5 relay mode
• [ ] Shelly 2.5 roller mode
• [ ] Shelly i3
• [ ] Shelly Dimmer 2
• [ ] Shelly Bulb
• [ ] Shelly Bulb DUO
• [ ] Shelly Bulb RGBW
• [ ] Shelly Motion 2
• [ ] Shelly Plus H&T
• [ ] Shelly Plus I4
• [ ] Shelly Plug S
• [ ] Shelly Plug S Gen3
• [x] Shelly 1 Gen4
• [ ] Shelly Plus 2PM relay mode
• [x] Shelly 2PM Gen3 relay mode
• [x] Shelly 2PM Gen3 cover mode
• [ ] Shelly Pro 2
• [ ] Shelly Pro 2PM
• [ ] Shelly Pro 3
• [ ] Shelly Pro EM50
• [ ] Shelly Pro 3EM thriphase mode
• [ ] Shelly Pro 4PM
• [ ] Shelly Pro Dual Cover PM
• [ ] Shelly Pro RGBWW PM (cct, light, rgb+cct, rgb+lights profiles)
• [ ] Shelly Plus RGBW PM (all profiles)
• [ ] Shelly RGBW2 (color profile)

Type of change

• [ ] Dependency upgrade
• [ ] Bugfix (non-breaking change which fixes an issue)
• [ ] New integration (thank you!)
• [x] 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

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:
• Link to developer documentation pull request:
• Link to frontend pull request:

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 Ruff (ruff format 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.

To help with the load of incoming pull requests:

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

[home-assistant[bot]]

Hey there @balloob, @thecode, @chemelli74, @bdraco, mind taking a look at this pull request as it has been labeled with an integration (shelly) you are listed as a code owner for? Thanks!

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• @home-assistant close Closes the pull request.
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• @home-assistant reopen Reopen the pull request.
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[thecode]

I think we should do Add snapshot for all device entities in a separate PR (since this PR is too big)

[bieniu]

I think we should do Add snapshot for all device entities in a separate PR (since this PR is too big)

Ok, will remove this from this PR.

[bieniu]

Thanks guys!