Replace API.sensors.async_get_nearby_sensor_indices

[bachya]

Describe what the PR does:

It turns out that API.sensors.async_get_nearby_sensor_indicies isn't quite right – it adds unnecessary complexity to the request model and if the user wants more information on those sensors, they're stuck doing two API calls. This PR replaces API.sensors.async_get_nearby_sensor_indicies with API.sensors.async_get_nearby_sensors: instead of returning a sorted list of sensor indices, we now return a sorted list of SensorModel objects.

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.

[codeclimate]

Code Climate has analyzed commit d55d8c3 and detected 0 issues on this pull request.

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[codecov]

Codecov Report

Merging #24 (d55d8c3) into dev (db6269c) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##               dev       #24   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           12        12           
  Lines          481       480    -1     
=========================================
- Hits           481       480    -1     

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

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