Update dsmr_reader sensor definitions

[Glodenox]

Proposed change

• Revert the state class removal, as that bug has been fixed at DSMR Reader.
• Fixes DSMR_Reader: not creating sensors for mqtt topic 'dsmr/consumption/quarter-hour-peak-electricity' #83999 by supporting the new quarter hour peak usage data sensors provided by DSMR Reader
• Make sensor names unique, so the documentation PR can point to these names
• Use the new unit enumerations (just noticed that some of those already happened while making this PR)
• Fix a sensor name that had been incorrect for quite a while

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 DSMR_Reader: not creating sensors for mqtt topic 'dsmr/consumption/quarter-hour-peak-electricity' #83999
• Link to documentation pull request: Add new quarter hour peak consumption data source home-assistant.io#25341

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.

To help with the load of incoming pull requests:

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

[home-assistant]

Hey there @depl0y, mind taking a look at this pull request as it has been labeled with an integration (dsmr_reader) you are listed as a code owner for? Thanks!

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[frenck]

This PR contains multiple things, including fixes, adjustments, and new features. These should be split.

[Glodenox]

Fine. The pull request was starting to get messy with the several changes done in parallel for the new unit enumerations anyway.