Dynamic attributes config

[NickM-27]

Proposed change

Allow configuring what labels are to be treated as attributes of another label. Also adds the ability for this to be defined dynamically by the Frigate+ config.

Type of change

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

Checklist

• [x] 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] The code has been formatted using Ruff (ruff format frigate)

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