Make optional deps really optional

[rytilahti]

This assigns groups to netifaces and android_backup dependencies so that they shouldn't be required for building the package (e.g. by installing the git checkout using pip). PKGINFO looks like this for them now:

Requires-Dist: android_backup (>=0,<1); extra == "backup_extraction"
Requires-Dist: netifaces (>=0,<1); extra == "updater"

This allows simpler windows builds, related to #1735

[codecov-commenter]

Codecov Report

Merging #1738 (9609b3a) into master (2a33f41) will decrease coverage by 0.01%.
The diff coverage is n/a.

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@@            Coverage Diff             @@
##           master    #1738      +/-   ##
==========================================
- Coverage   81.93%   81.92%   -0.01%     
==========================================
  Files         196      196              
  Lines       18054    18057       +3     
  Branches     3863     3794      -69     
==========================================
+ Hits        14793    14794       +1     
- Misses       2972     2996      +24     
+ Partials      289      267      -22     

Impacted Files	Coverage Δ
miio/device.py	81.21% <0.00%> (-0.81%)	⬇️
miio/devtools/__init__.py	0.00% <0.00%> (ø)
miio/devtools/pcapparser.py	0.00% <0.00%> (ø)
miio/devtools/propertytester.py	0.00% <0.00%> (ø)
miio/devtools/simulators/miiosimulator.py	0.00% <0.00%> (ø)
miio/devtools/simulators/miotsimulator.py	0.00% <0.00%> (ø)
miio/integrations/zimi/clock/alarmclock.py	0.00% <0.00%> (ø)
miio/integrations/roborock/vacuum/vacuum.py	64.83% <0.00%> (ø)

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