* Backport code from #86386
* Add tests
* Remove local dev change
* Implement device class validation based on unit
* Swap sensor and externalsensor classes (based on importance)
* Use translations for external sensor entities
* Re-add meter identifier as sensor for external devices
* Add migration for Gas identifier
* Rename HomeWizardExternalIdentifierSensorEntity class
* Fix all existing tests
* Reimplement tests for extenal devices with smapshots
* Remove non-used 'None' type in unit
* Add migration test
* Clean up parameterize
* Add test to fix last coverage issue
* Fix non-frozen mypy issue
* Set device name via added EntityDescription field
* Remove device key translations for external sensors,
* Bring back translation keys
* Set device unique_id as serial number
* Remove meter identifier sensor
* Simplify external device initialization
* Adjust tests
* Remove unused gas_meter_id migration
* Remove external_devices redaction
* Remove old gas meter id sensor after migration
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