Define data flow result type

[KapJI]

Proposed change

Motivation

This is another step of my initiative to make it possible to annotate components with types without using Any.
This allows to completely get rid of Any in config flow of the component.

Another advantages:

• More type safety. TypedDict verifies that only listed keys are accessed and their types match.
• Get rid of many dict[str, Any], dict[Any, Any] or even just Any.
• Developers of components can know what to expect from result value of data flow methods.
• Remove multiple # type: ignore annotations.

Only type hints are changed, behaviour remains exactly the same as before.

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.
• Untested files have been added to .coveragerc.

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[probot-home-assistant]

Hey there @dermotduffy, mind taking a look at this pull request as its been labeled with an integration (hyperion) you are listed as a codeowner for? Thanks!
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[probot-home-assistant]

Hey there @home-assistant/supervisor, mind taking a look at this pull request as its been labeled with an integration (hassio) you are listed as a codeowner for? Thanks!
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[MartinHjelmare]

Looks good!

[bdraco]

LGTM 👍