Rewrite to support async/ASGI Django (Waiting for Django ORM to be async)

[JonasKs]

This issue is waiting for the Django ORM to be async and pushed to master

We all had our hopes up for an async ORM to be pushed with Django 3.2, but this seems unlikely at the moment. Alpha has been released without any mention of async, and the ORM design has not been finalized.

I've created this issue to document and discuss anything related to this.

[JonasKs]

This can now be started.

I am no longer using Django myself, but I'll be happy to review if someone wants to implement it.

Example async aware middleware for Django can be found in our other repo django-guid