Add child devices from hubs to generated list of supported devices

[sdb9696]

Updates generate_supported hook to include child devices of hubs in the list of supported devices.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 90.40%. Comparing base (c5d65b6) to head (e40bf35).

Files	Patch %	Lines
kasa/smart/smartdevice.py	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #898      +/-   ##
==========================================
- Coverage   90.48%   90.40%   -0.08%     
==========================================
  Files          70       70              
  Lines        4937     4941       +4     
  Branches     1218     1220       +2     
==========================================
  Hits         4467     4467              
- Misses        380      384       +4     
  Partials       90       90              

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[rytilahti]

LGTM after fixing the child device categorization, feel free to merge as you wish!

[sdb9696]

Categorisation changed as per comment and a note added about hub connected devices working across TAPO/KASA branded hubs even if they don't work across the native apps.