💡 INF level log after successful token retrieval

[XVII]

Describe the feature you'd like

When the user is redirected to a browser to complete authentication, there is no immediate STDOUT INF log that indicates whether a token was retrieved successfully or not.

This limits the automation of cloudflared as there's no way to know if the connection was actually auth'd or not.

Describe alternatives you've considered

At the moment I just use an arbitrary sleep to guess when it might have been approved.

I have seen the following pop up after some time (Windows) but it doesn't appear until a few minutes after. Perhaps a log flushing issue?

Additional context