To:
- to receive the origin in that slot
- incidentally, respect the db model

Goal: Reducing dependencies

This includes:

- dropping the old swh.deposit.auth module which included a basic
  authentication middleware. We now use djangorestframework's (drf).
  We did not prior to this due to some package version issue.

- As this returns json response in failing authentication though, we
  convert the response into an swh-deposit one (that code remained in
  the swh.deposit.auth module)