CAE implementation work for Ruby

[baywet]

details to be found in #1179 and corresponding PR. Continuation of #1643

Because Ruby doesn't have an azure identity library, we won't be able to fully support CAE from the get go. However we can do the infrastructure work to prepare its support which includes:

• getting the value from the www-authenticate response header in the http request adapter and retrying the request (once)
• using the value in the access token provider to request a new token
• set the cp1 capability when requesting tokens