[DO NOT MERGE] Add web socket server

[dmulcahey]

This PR is so I can track the structure and organization of combining ZHA and ZHAWS into a single lib. I'll open smaller PR's to get things merged once things settle

[codecov]

Codecov Report

Attention: Patch coverage is 89.00081% with 273 lines in your changes missing coverage. Please review.

Project coverage is 94.62%. Comparing base (636ad13) to head (f3c1e48).

Files with missing lines	Patch %	Lines
zha/websocket/client/helpers.py	69.92%	83 Missing ⚠️
zha/websocket/server/gateway_api.py	85.96%	32 Missing ⚠️
zha/websocket/client/client.py	81.87%	27 Missing ⚠️
zha/websocket/server/client.py	78.74%	27 Missing ⚠️
zha/websocket/client/model/messages.py	44.18%	24 Missing ⚠️
zha/websocket/server/gateway.py	83.63%	18 Missing ⚠️
zha/websocket/client/controller.py	89.05%	15 Missing ⚠️
zha/websocket/client/proxy.py	88.33%	7 Missing ⚠️
zha/websocket/server/api/platforms/lock/api.py	90.16%	6 Missing ⚠️
zha/websocket/server/api/platforms/light/api.py	87.80%	5 Missing ⚠️
... and 10 more

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #250      +/-   ##
==========================================
- Coverage   96.31%   94.62%   -1.69%     
==========================================
  Files          61      104      +43     
  Lines        9368    11489    +2121     
==========================================
+ Hits         9023    10872    +1849     
- Misses        345      617     +272     

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