Use _mappings for all miot integrations

[rytilahti]

• Simplifies the code as there is no need to define supported models separately
  • The keys from mappings are used as supported models, this will be extended to miio devices in the future, too.
• Mass convert miot devices to use _mappings instead of mapping
• Add tests to verify that deprecated 'mapping' is not used and the data structure is what is expected, re Found an unsupported model 'zhimi.fan.za5' for class 'FanZA5' #1344
• As class properties are supported only from python3.9 onwards, the supported_models is now defined in the meta class.

[codecov-commenter]

Codecov Report

Merging #1349 (032e3b1) into master (6e5b153) will decrease coverage by 0.18%.
The diff coverage is 96.77%.

@@            Coverage Diff             @@
##           master    #1349      +/-   ##
==========================================
- Coverage   82.35%   82.17%   -0.19%     
==========================================
  Files         109      109              
  Lines       11789    11784       -5     
  Branches     1382     1386       +4     
==========================================
- Hits         9709     9683      -26     
- Misses       1869     1893      +24     
+ Partials      211      208       -3     

Impacted Files	Coverage Δ
miio/airpurifier_miot.py	83.08% <ø> (-0.09%)	⬇️
miio/heater_miot.py	87.35% <ø> (-0.15%)	⬇️
miio/integrations/fan/zhimi/zhimi_miot.py	82.03% <ø> (-0.14%)	⬇️
...io/integrations/vacuum/dreame/dreamevacuum_miot.py	74.91% <ø> (-0.09%)	⬇️
...io/integrations/vacuum/roidmi/roidmivacuum_miot.py	89.45% <66.66%> (-0.04%)	⬇️
miio/airconditioner_miot.py	91.90% <100.00%> (ø)
miio/airhumidifier_miot.py	84.61% <100.00%> (-0.20%)	⬇️
miio/airqualitymonitor_miot.py	98.94% <100.00%> (-0.02%)	⬇️
miio/click_common.py	51.98% <100.00%> (+0.72%)	⬆️
miio/curtain_youpin.py	72.83% <100.00%> (-0.34%)	⬇️
... and 9 more

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