Support attributes in conditional rows

[swiergot]

Proposed change

Allow testing against entity's attribute in conditional rows.

Type of change

• [ ] Dependency upgrade
• [ ] Bugfix (non-breaking change which fixes an issue)
• [x] New feature (thank you!)
• [ ] Breaking change (fix/feature causing existing functionality to break)
• [ ] Code quality improvements to existing code or addition of tests

Example configuration

- type: conditional
  conditions:
    - entity: fan.mi_air_purifier_pro
      attribute: "preset_mode"
      state: "Favorite"
  row:
    entity: number.mi_air_purifier_pro_favorite_level

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue or discussion:
• Link to documentation pull request: https://github.com/home-assistant/home-assistant.io/pull/23920

Checklist

• [x] The code change is tested and works locally.
• [x] There is no commented out code in this PR.
• [ ] Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

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

[bramkragten]

this would not only change it for conditional rows, but also for conditional cards, please also update the conditionStruct used in the editor.

[github-actions[bot]]

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