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)

The actual dependency to the current code does not depend on the
latest yet.

The retrieval of archives can temporarily build an archive from
multiple ones before sending its content to the client.  As a result,
when retrieving a content, we leave in a temporary location an
archive.  This temporary archive is referenced in a table
deposit_temporary_archive.

This adds a service which is in charge to poll regularly and delete
old temporary archives.

This possibly aggregates multiple archives into one and stream the
result to the client.

This is incomplete for now as the possibly temporary archive
referenced is left on the server.