way of updating a token

Hello,

Currently, there doesn't appear to be a way to update a token except for recreating a whole new `forge` instance (which is heavy).
Thus, we are running into timeout issues when trying to use a `forge` instance that is then used by other code to register many entities.

Would it be possible to have a callback that could be set on `forge` creation? `Forge` could then call the callback when it notices that API requests are failing due to expired token, or after checking that a token is expired.

thanks