Refresh and logout token for gatekeeper

[vlf-stefan-drobic]

Implement refresh token api (alongside logout) that handles requests made while integrated with gatekeeper (for example when deploying with bootstrap, and frontend needs to refresh a token, backend should get a call and route it to gatekeeper)

[vlf-stefan-drobic]

This has been merged into the fork

[vlf-stefan-drobic]

The PR for this is here.
Once it's been merged, this can be closed