✨ Make session time more flexible

[fynnlyte]

Currently, there is one fixed session time for every user.

It should be possible for the user to request a different, pre-configured session duration based on his request, e.g.:

• 5 days if „stay logged in“ is selected
• 5 minutes otherwise

The supported keys can be sent when logging in, resetting password - also when refreshing the session?

• Or should the choice be persisted after logging in?
• User could have multiple sessions: One with longer validity, one with shorter. Would be good to save the key (or duration?) directly at the session-record.
  • fall back to default if current config entry was dropped?
  • if existing config-entry was modified -> extend session life accordingly, not according to how it was initially set!

In a later iteration:

• allow to specify a different session duration if users have a certain role assigned via the config -> shorter session life for admins/internal staff than for normal users