Alter response payload for API.sensors.async_get_nearby_sensors

[bachya]

Describe what the PR does:

During the implementation of the Home Assistant integration, I found a situation where it'd be useful for the results of API.sensors.async_get_nearby_sensors to return the SensorModel objects and the calculated distance for each.

Does this fix a specific issue?

N/A

Checklist:

• Confirm that one or more new tests are written for the new functionality.
• Run tests and ensure everything passes (with 100% test coverage).
• Update README.md with any new documentation.
• Add yourself to AUTHORS.md.

[codecov]

Codecov Report

Merging #28 (d3a4e72) into dev (4fe5f08) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##               dev       #28   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           12        12           
  Lines          480       486    +6     
=========================================
+ Hits           480       486    +6     

Impacted Files	Coverage Δ
aiopurpleair/endpoints/sensors.py	100.00% <100.00%> (ø)

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