Replace DRF with connexion

[rgreinho]

Types of changes

• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Code cleanup / Refactoring
• Documentation

Description

connexion is a framework that automagically handles HTTP requests based on OpenAPI Specification. The routes and the documentation are autogenerated. Models are being validated against the specification.

• Remove all django files
• Update requirements
• Create function to generate and configure a connexion app
• Implement a way to manage the settings similar to what was done for DRF
• Fix the unit tests
• Fix integration tests
• Update the docker image
• Fix the wheel package
• Update and clean up Makefile
• Update the GitHub PR template

Checklist:

• [] I have updated the documentation accordingly
• [X] I have written unit tests

Fixes request-yo-racks/api#60

[codecov-io]

Codecov Report

Merging #70 into master will decrease coverage by 0.39%. The diff coverage is 94.11%.

@@            Coverage Diff            @@
##           master      #70     +/-   ##
=========================================
- Coverage   98.34%   97.94%   -0.4%     
=========================================
  Files           6        6             
  Lines         241      243      +2     
=========================================
+ Hits          237      238      +1     
- Misses          4        5      +1

Impacted Files	Coverage Δ
api/collectors/google.py	100% <100%> (ø)
api/collectors/generic.py	100% <100%> (ø)
api/collectors/yelp.py	100% <100%> (ø)
api/collectors/base.py	100% <100%> (ø)
api/celery/tasks.py	85.29% <80%> (-2.21%)	:arrow_down:

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