Network scanning interface

[puddly]

Implements zigpy/zigpy#1461. As usual, only supported by EmberZNet.

zigpy-znp technically implements this interface but it requires NVRAM modification and cannot be called without fully shutting down the stack.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 30 lines in your changes missing coverage. Please review.

Project coverage is 2.62%. Comparing base (2f7eec1) to head (410b285).
Report is 1 commits behind head on dev.

Files with missing lines	Patch %	Lines
zigpy_cli/radio.py	0.00%	30 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##             dev     #55      +/-   ##
========================================
- Coverage   2.75%   2.62%   -0.14%     
========================================
  Files          9       9              
  Lines        580     610      +30     
========================================
  Hits          16      16              
- Misses       564     594      +30     

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