Allow to assign profile picture by taking a picture with the laptops camera

### Problem

Users might want to use a real life picture of their own as profile picture for their user account.
But they might not have one available as file to import at that moment.

### Proposal

When clicking the profile picture in the user management view, the menu should have an additional option "use camera" in the menu that opens up.
When pressing that option, a camera app should open.
Then, when the user presses the "take photo" button, the picture taken should be displayed to the user for review.
When the user declines, he should have another attempt to take a new photo in the still open camera app. When the user accepts, the file should be saved and automatically assigned as profile picture.

### Prior Art (Optional)

_No response_