feat(oauth2): handle refresh token expiration

[fioan89]

Refresh tokens can expire after a certain amount of time. The expiration can happen during a live session or when the Toolbox is closed.
Inspecting the coder code it looks like 400 Bad request is raised

{
  "error": "invalid_grant",
  "error_description": "The refresh token is invalid or expired"
}

when we try to refresh an access token with an expired refresh token. Coder Toolbox should be able to handle this scenario.

[fioan89]

Also take into account if client_id is not accepted:
If refresh_token is rejected -> get a new refresh token using the already registered client
If client_id is rejected -> register a new client