Feature Request: Add binary sensor entities for each area per device.

## Feature Request
Add binary sensor entities for each area per device.
i.e.
My Phone Area: "Bedroom"

My Phone Bedroom: true
My Phone Kitchen: false

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For alternatives, I can/could create a helper entity per zone per device, i.e.
helper -> binary -> true if My Phone area === 'Bedroom' or etc.

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This would make it easier to integrate this as part of other presence systems, i.e. WIAB.

Specifically I'm using https://github.com/Hankanman/Area-Occupancy-Detection
related issue: https://github.com/Hankanman/Area-Occupancy-Detection/issues/25