Move Guardian services to entity platform services

[bachya]

Proposed change

Per #37188 (comment), this PR moves all of Guardian's services to entity platform services (so that more than one Guardian device can be accommodated).

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)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

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# Example configuration.yaml

Additional information

• This PR fixes or closes issue: fixes #
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Checklist

• The code change is tested and works locally.
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[MartinHjelmare]

How will we target the entities without entity_id or area_id in the service call data (service schema)?

[balloob]

Oh you're right. Entity Platform doesn't handle this case. I guess it's broken now 🤷