Energy distance units

[jschlyter]

Proposed change

Add an energy_distance sensor device class with support for unit conversion between metric and US customary energy consumption units by distance, including their inverses (Europe normally uses energy per distance whereas US/UK uses distance per energy). The following units should be supported:

• kWh/100km
• mi/kWh
• km/kWh

Discussed in home-assistant/architecture#1163

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: Energy distance units home-assistant.io#37213 Add documentation for units for energy by distance developers.home-assistant#2548

Checklist

• The code change is tested and works locally.
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[home-assistant]

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[jschlyter]

Ping @fredriklj, please review for https://github.com/CJNE/ha-porscheconnect

[abmantis]

The tests are failing:

FAILED tests/util/test_unit_conversion.py::test_all_converters[EnergyDistanceConverter] - AssertionError: converter is not present in _GET_UNIT_RATIO

[epenet]

My concerns have been addressed

[abmantis]

Thanks!