Dynamically map state class, device class and UoM in ZHA smart energy metering sensor

[jpbede]

Proposed change

Currently, the status class and the device class are statically assigned for the ZHA sensors 'SmartEnergyMetering' and 'SmartEnergySummation', which leads to inadmissible use, e.g. the device class 'Energy' is assigned for a sensor measuring liters.

This PR creates a additional mapping for state class and device class besides the unit of measurement. Noticed while doing https://github.com/home-assistant/core/pull/107639

In addition, these attributes are set in the __init__ to prevent them from being looked up again and again.

Type of change

• [ ] Dependency upgrade
• [x] 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 #85554
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• [ ] The code change is tested and works locally.
• [x] Local tests pass. Your PR cannot be merged unless tests pass
• [x] There is no commented out code in this PR.
• [x] I have followed the development checklist
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• [ ] Tests have been added to verify that the new code works.

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• [ ] Documentation added/updated for www.home-assistant.io

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[MartinHjelmare]

The changed test needs to be reviewed by a code owner. The rest looks good.

[elupus]

@MartinHjelmare i think your review is stale? Still okey with this change?