swh.deposit.cli: Transform create_user into a main cli (+ docs updates)
- Improve the user create subcommand to create the collection if need be (instead of stopping and doing an extra command ~> tedious).
- Improve the user subcommand cli to allow basic listing
- Open cli subtask to manipulate collections (list, create) as well
- docs/sys-info: Update user creation routine documentation
- dev-info: Update according to latest configuration change
Related #1580 (closed)
Test Plan
tox
Migrated from D1184 (view on Phabricator)