Clean up events and properties

[dmulcahey]

This PR:

• converts remaining events to dataclasses
• converts to_json -> info_object and makes it a property
• converts get_state -> state and makes it a property
• leverages cached_property where it makes sense to / is safe to. There are probably more that can be converted
• rearranged code so properties come before methods for consistency (init, init_from_quirks are left before props)

fixes #7 by disabling the error globally for tests as there are a ton of false positives

[codecov]

Codecov Report

Attention: Patch coverage is 99.18033% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 93.50%. Comparing base (b5f068a) to head (e4f8f3d).

Files	Patch %	Lines
zha/application/platforms/light/__init__.py	94.33%	3 Missing ⚠️
zha/application/platforms/cover/__init__.py	93.54%	2 Missing ⚠️
zha/application/platforms/sensor/__init__.py	98.48%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev      #20      +/-   ##
==========================================
+ Coverage   93.28%   93.50%   +0.22%     
==========================================
  Files          61       61              
  Lines        9082     9330     +248     
==========================================
+ Hits         8472     8724     +252     
+ Misses        610      606       -4     

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