[Feat]: code-server kill all sessions

## What is your suggestion?
implement a feature to kill all sessions such that one needs to sign in to code server by explicitly entering the authentication password.

## Why do you want this feature?
Our team uses code-server and when our team member leaves, we cannot remove access for him as he is already signed in from his browser and we can never log him out as even password change doesn't effect the existing session

## Are there any workarounds to get this functionality today?
no

## Are you interested in submitting a PR for this?

no

No files, tests, or entry points are named. Start by locating code-server's authentication and session handling, then determine how a user-triggered kill-all-sessions action should invalidate existing browser sessions and require the authentication password again; done means prior sessions no longer grant access after the action.

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