Limit user creation to database connections

[Widcket]

Description

This PR limits the creation of users to database connections.

The endpoint supports passwordless connections as well, but we do not yet support the input of phone numbers.

References

Fixes #334

Testing

• This change adds test coverage for new/changed/fixed functionality

Checklist

• I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not master

[jfatta]

LGTM

[jugglingjsons]

Could we get a follow up on this one - are there any plans to support passwordless users creation in the CLI ?
Even if limited to email only for the time being? Thanks in advance!

[sergiught]

Hey @jugglingjsons, thanks for the inquiry. Would you mind opening a separate issue for that so we can track it?

For transparency we don't currently have any active development planned for the cli for this quarter. But we're more than happy to review community contributions until we are able to redirect more of our focus and energies to the cli.