frequent reauthentication (github enterprise with SSO)

After setting `vim.g.copilot_auth_provider_url` and authenticating, the extension works superbly.

But the token for copilot.vim is valid as long as your SSO session lasts. Typically 24 hours. This leads to frequent reauthentication. I believe VSCode manages a refresh token so you do not have to reauthenticate.

Is it feasible to support refresh tokens? If not, do you have any ideas for a workaround?