Add the authenticator account endpoint to the spec file

[telday]

/:authenticator/:service_id/:account

Documentation

AC:

• The endpoint is added to the spec file
• There are integration tests for the endpoint

[izgeri]

when we add this endpoint, we should also add a note to explain that it's not completely implemented yet:

This endpoint is part of an early implementation of support for enabling Conjur authenticators via the API, and is currently available at the Community (or early alpha) level. This endpoint is still subject to breaking changes in the future.