Refactor into event submodule

[abhinavsingh]

To demonstrate core event architecture and its usage in applications.

[codecov]

Codecov Report

Merging #257 into develop will increase coverage by 0.21%.
The diff coverage is 82.92%.

@@             Coverage Diff             @@
##           develop     #257      +/-   ##
===========================================
+ Coverage    72.84%   73.06%   +0.21%     
===========================================
  Files           70       74       +4     
  Lines         2817     2840      +23     
===========================================
+ Hits          2052     2075      +23     
  Misses         765      765

Impacted Files	Coverage Δ
proxy/core/event/names.py	100% <100%> (ø)
proxy/core/event/queue.py	100% <100%> (ø)
proxy/core/event/__init__.py	100% <100%> (ø)
proxy/core/event/dispatcher.py	65.11% <65.11%> (ø)
proxy/core/event/subscriber.py	88.88% <88.88%> (ø)

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