Alert Integrations

[JohnBrennan95]

Created the core functionality for the alerting integrations. Unit tests passing, functioning as intended. Once we get an actual target for the email and slack notifications, in theory we can test in an actual env. Will need valid credentials for slack and whatever email will be used. I suggest we use a dedicated slack channel / email in the event that we create lots of spam while testing.

[codecov]

Codecov Report

❌ Patch coverage is 75.97403% with 37 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.17%. Comparing base (e54cb68) to head (95c62f4).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/critic/libs/mailgun.py	27.77%	13 Missing ⚠️
src/critic/alerts.py	72.72%	10 Missing and 2 partials ⚠️
src/critic/libs/slack.py	33.33%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #71      +/-   ##
==========================================
- Coverage   91.67%   89.17%   -2.51%     
==========================================
  Files          17       21       +4     
  Lines         829      979     +150     
  Branches       60       73      +13     
==========================================
+ Hits          760      873     +113     
- Misses         57       92      +35     
- Partials       12       14       +2     

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