Add 2FA column to user list

[timobrembeck]

Motivation

With #1884, I think 2FA will play a bigger role in our CMS, so it would be cool to see in the user list who enabled 2FA

Proposed Solution

Add a new column to the user list which contains info about the 2 factor authentication methods a user has enabled (either FIDO2 or TOTP).

Alternatives

Additional Context

We could also add another filter to the user form to e.g. get all users who have 2fa enabled/disabled.