Expose sensors, switches, and settings for zhimi.airhumidifier

[Kirmas]

-sensor decorator
-switch decorator
-setting decorator

for correct working off this rytilahti/home-assistant#3 or similar changes must be merged

[codecov-commenter]

Codecov Report

Merging #1508 (0d1b897) into master (d544083) will increase coverage by 0.00%.
The diff coverage is 82.35%.

@@            Coverage Diff            @@
##           master    #1508     +/-   ##
=========================================
  Coverage   82.15%   82.15%             
=========================================
  Files         145      145             
  Lines       14161    14178     +17     
  Branches     3416     1608   -1808     
=========================================
+ Hits        11634    11648     +14     
- Misses       2302     2305      +3     
  Partials      225      225             

Impacted Files	Coverage Δ
...iio/integrations/humidifier/zhimi/airhumidifier.py	90.24% <82.35%> (-0.72%)	⬇️

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[rytilahti]

Thanks @Kirmas, let's get this merged and worry about the units & extra metadata issues later when we get some more integrations converted!