[Feature Request] Support multiple logged in users

[popey456963]

There are times when people wish for multiple accounts on a single service, such as a work account and a personal account. These are generally considered completely separate accounts with different usernames & passwords (if using local-auth).

At the moment there seems no way to support keeping both logged in at once, and being able to 'switch between them', without requiring the user to go through the login flow again.

Existing examples of this in the wild might include Google or AWS:

It would be nice if Passport supported such "account multiplexing".