Create the concept of super-admin user

[adrianthedev]

Context

There are a couple of times we need this. For example, when we want to show errors in Avo, we show them only in development so we don't crash the app in production. But if the tester doesn't reach that sad path of finding the error in development, they might see it in production and we won't show an error. This will cause it to fail silently and that's annoying.

With this feature, a super-admin can go in production, reproduce the issue and get the error right the in context.