Option to login as end user from Studio

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 …