[Backend] As a user, I can sign out #34
Description
Why
As users can sign in, the app must have an option for users to sign out. Signing out should completely remove any account-related footprints of the user.
Acceptance Criteria
Call POST /api/v1/oauth/revoke to sign out with the following body:
{
"token": "{{user_access_token}}",
"client_id": "{{client_id}}",
"client_secret": "{{client_secret}}"
}