Import device tracker constants from root

[epenet]

Proposed change

Linked to #78014
Needs:

• Expose constants in device_tracker root #78240

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[Kane610]

Looks good for unifi

[cdce8p]

Should the ScannerEntity and TrackerEnitity be exposed in device_tracker.__init__?

[balloob]

Yes. Anything that another integration will need should be available via root.

[epenet]

@balloob / @cdce8p I will start work on these as soon as #78014 is merged.
We just need to get these four over the line first:

• Use new media player enums in forked_daapd #78100
• Import network constants from root #78342
• Expose humidifier constants at the top level #78033
• Import humidifier constants from root #78343