[BUILD-423] Update our project to use ASGI (PR #2147)

BUILD-423

Proposed changes

This PR adds asgi.py, the uvicorn dependency in production and updates Procfile so that future deployments use gunicorn with a uvicorn worker class.

The goal with that is to enable django to handle async views.

How to reproduce

  • Staging deploy should pass
  • All tests should pass, everything should work as usual
  • WIP: should be able to use http streaming response

Screenshots and videos

None

Further comments

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GitHub

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.82%. Comparing base (5082026) to head (5139838).

Additional details and impacted files
@@           Coverage Diff           @@
##              dev    #2147   +/-   ##
=======================================
  Coverage   97.82%   97.82%           
=======================================
  Files         156      156           
  Lines       21841    21841           
=======================================
  Hits        21365    21365           
  Misses        476      476           

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