Move remaining keys to setup.cfg

[cdce8p]

Proposed change

Complete the move from setup.py to setup.cfg.
Depends on #65145, since this PR removes setup.py completely and thus python setup.py sdist bdist_wheel won't work.

Additional improvements

• Add the missing long_description_content_type key
• Remove the license_file key and LICENSE.md from MANIFEST.in. Both setuptools and wheel automatically include it already. The new license_files key would only be necessary if the filename didn't match the default glob pattern. https://setuptools.pypa.io/en/latest/references/keywords.html?highlight=license_files#keywords
• Change find_package from exclude tests* to include homeassistant*. At the moment all python files inside the script folder are included in the final package. Unless I'm missing something, those don't need to be included. The Home-Assistant scripts are still included (homeassistant/scripts).
  https://github.com/home-assistant/core/tree/dev/script

Full list of files which won't be included with these changes (compared to what is included now)!

script/__init__.py
script/gen_requirements_all.py
script/inspect_schemas.py
script/lazytox.py
script/version_bump.py
script/hassfest/__init__.py
script/hassfest/__main__.py
script/hassfest/codeowners.py
script/hassfest/config_flow.py
script/hassfest/coverage.py
script/hassfest/dependencies.py
script/hassfest/dhcp.py
script/hassfest/json.py
script/hassfest/manifest.py
script/hassfest/manifest_helper.py
script/hassfest/metadata.py
script/hassfest/model.py
script/hassfest/mqtt.py
script/hassfest/mypy_config.py
script/hassfest/requirements.py
script/hassfest/services.py
script/hassfest/ssdp.py
script/hassfest/translations.py
script/hassfest/usb.py
script/hassfest/zeroconf.py
script/scaffold/__init__.py
script/scaffold/__main__.py
script/scaffold/const.py
script/scaffold/docs.py
script/scaffold/error.py
script/scaffold/gather_info.py
script/scaffold/generate.py
script/scaffold/model.py
script/translations/__init__.py
script/translations/__main__.py
script/translations/clean.py
script/translations/const.py
script/translations/develop.py
script/translations/download.py
script/translations/error.py
script/translations/frontend.py
script/translations/lokalise.py
script/translations/migrate.py
script/translations/upload.py
script/translations/util.py

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)
• 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
• 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.

The integration reached or maintains the following Integration Quality Scale:

• No score or internal
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To help with the load of incoming pull requests:

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

[balloob]

Nice!

[cdce8p]

I did some more testing to make sure everything still works as expected. Turns out we can't remove setup.py just yet. Support for editable installs with build-backends was only added in pip 21.3. So we need to keep it around a bit longer. Besides that, I didn't notice anything unusual. Since #65145 has been merged, this would also be good to go.

Not required, but I would suggest to cherry-pick it, too. That way we do all of them together.

I don't expect any issues, but if someone still encounters any, please let me know. I should be able to help.