Option to login as end user from Studio

[justusbluemer]

Hi!
In the past I've found myself wanting to log into my app as one of my users, essentially impersonating them exactly:

1. Support
   For complex applications with not-so-technical users it's useful during onboarding to take the first steps together with the user, live during a screen sharing session. Showing them literally around their own account can make things more personalized and/or if you're solving a problem, you can see your own app exactly as your user sees it and discover edge cases you might not have even considered.

2. Testing
   For that extra piece of mind, it can be helpful to login to your app as real users to double and triple check to make sure everything's showing up for them exactly as intended. Or just for internal tests users, whatever's more appropriate.

Currently, logging in as a user isn't that easy and requires generating a one-time-login link and using that, there's no built-in functionality.
I've already created a web app for that: https://github.com/justusbluemer/supa-user-login
But it would be much nicer (and more trustworthy of course) to have this natively through Supabase studio.