Authorize `userapp` with and without PKCE

Use this API to authenticate userapp(s) with fabric Identity. This API is not needed for sysapp authentication (see the /token API instead). The immediate response of this operation would be a browser re-direct to the hosted login page configured in fabric Identity. Once the end user is authenticated on the hosted login page, fabric Identity will perform a redirect back to the userapp on the provided redirect_uri. This API can be used for both authorization code flow with and without PKCE.

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