Dynamic switches for tplink

[rytilahti]

This PR is (the first) part of the tplink rewrite series, to be merged into tplink_rewrite branch (see #111151).

Proposed change

• Create a foundation to use upstream-provided information for creating entities, allowing to expose support for more devices and features while moving some maintenance burden from homeassistant to the upstream library.
• Convert switch platform to use the new facilities.
• Expose sub-devices as their own devices that define via_device.

TBD:

• TODOs in the code
• Consolidate unique id handling
• Tests
• Documentation update (if it's not better done prior merging the dev branch back to master?)

The screenshot below shows two new entities, and one that was previously hardcoded:

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

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation 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.
• 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]

Hey there @TheGardenMonkey, @bdraco, @sdb9696, mind taking a look at this pull request as it has been labeled with an integration (tplink) you are listed as a code owner for? Thanks!

Code owner commands

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[home-assistant]

There is a merge conflict.

[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.

conflict fixed

[sdb9696]

LGTM!