Add Air Purifier Pro H support

[pvizeli]

Success of #1093

The Pro H works like the 3H just a bit bigger.

[pvizeli]

According: #1186

I did not notice that. How is the best way to address this?

[rytilahti]

Considering it's working already, I would simply add it to the supported devices in the integration itself. The implementing class (AirPurifierMiot) does not currently have _supported_devices variable, but one should be added as the plan is to start using that information to allow initializing device classes based on the model information.

The mdns discovery information is not currently used at all, but it could be a part of extended metadata that will in the future get exposed over the supported_devices(). The aim is to move out device specific handling inside the lib so that downstreams do not have to keep their own mappings for things.

[codecov-commenter]

Codecov Report

Merging #1185 (50ccbc4) into master (452d436) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1185   +/-   ##
=======================================
  Coverage   78.31%   78.31%           
=======================================
  Files          84       84           
  Lines        9532     9532           
  Branches      778      778           
=======================================
  Hits         7465     7465           
  Misses       1880     1880           
  Partials      187      187           

Impacted Files	Coverage Δ
miio/discovery.py	49.33% <ø> (ø)

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[pvizeli]

What I do not understand is why it work as mb3 device but the linked URL #1186 is complete different mapping