Port authentication related endpoints and models to labs

[devraj]

We are currently using labs in one of our test projects, and have found several bugs in the auth handlers (this is fine as it's the first real life test), we should port these back:

• operation ids for the various endpoints
• names of schema
• authenticating via various methods

Essentially copying the auth routers and schemas would be fine as the pilot project hasn't diverged too much from it.