Implement EventQueue

[shreyamalviya]

What does this PR do?

Fixes #2156

PR Checklist

• [ ] Have you added an explanation of what your changes do and why you'd like to include them?
• [ ] Is the TravisCI build passing?
• [ ] Was the CHANGELOG.md updated to reflect the changes?
• [ ] Was the documentation framework updated to reflect the changes?
• [ ] Have you checked that you haven't introduced any duplicate code?

Testing Checklist

• [ ] Added relevant unit tests?
• [ ] Have you successfully tested your changes locally? Elaborate:

  Tested by {Running the Monkey locally with relevant config/running Island/...}

• [ ] If applicable, add screenshots or log transcripts of the feature working

[codecov[bot]]

Codecov Report

Merging #2182 (cf1da83) into develop (89b194d) will increase coverage by 0.24%. The diff coverage is 87.30%.

:exclamation: Current head cf1da83 differs from pull request most recent head dcc2717. Consider uploading reports for the commit dcc2717 to get more accurate results

@@             Coverage Diff             @@
##           develop    #2182      +/-   ##
===========================================
+ Coverage    56.72%   56.96%   +0.24%     
===========================================
  Files          493      498       +5     
  Lines        13318    13379      +61     
===========================================
+ Hits          7555     7622      +67     
+ Misses        5763     5757       -6     

Impacted Files	Coverage Δ
monkey/monkey_island/cc/services/initialize.py	0.00% <0.00%> (ø)
monkey/common/event_queue/i_event_queue.py	76.47% <76.47%> (ø)
monkey/common/event_queue/__init__.py	100.00% <100.00%> (ø)
monkey/common/event_queue/pypubsub_event_queue.py	100.00% <100.00%> (ø)
monkey/common/event_queue/types.py	100.00% <100.00%> (ø)
monkey/common/events/__init__.py	100.00% <100.00%> (+100.00%)	:arrow_up:
monkey/monkey_island/cc/app.py	79.57% <0.00%> (-0.70%)	:arrow_down:
monkey/common/di_container.py	97.26% <0.00%> (-0.04%)	:arrow_down:
monkey/infection_monkey/monkey.py	0.00% <0.00%> (ø)
monkey/monkey_island/cc/resources/__init__.py	100.00% <0.00%> (ø)
... and 11 more

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