Distinguish between API resources and web frontend

[AndrewEckart]

Story

As a ServiceX developer I want to distinguish between frontend routes and API resources

Acceptance Criteria

1. API resources are placed in a subdirectory, e.g. https://<servicex-host>/api/v1/servicex/transformation
2. User management API endpoints should be organized under api/v1/user/...

Assumptions

1. A subdirectory is preferable to a subdomain (api.<servicex-host>) because both are being served by the same Flask app.

[BenGalewsky]

We need to make sure whatever structure we use works with our Ingres rules. The Ingres only exposes protected endpoints. There are a whole series of endpoints that are for internal use and therefore don't check authentication