[GNAP] Return current bootstrap data in auth response ID token

[Moopli]

After completing GNAP authorization, the wallet needs to call the auth server's bootstrap API to fetch current bootstrap data for the logged-in user. To avoid needing this call, the auth request handler and continue request handler could fetch the user's bootstrap data, and include it in the successful response. GNAP allows the Auth Server to create ID tokens to return in the auth/continue response on successful login, so we could create an ID token with custom claims for bootstrap data fields.