[BACK-3392] Add OpenID sector for Abbott OAuth

[darinkrauss]

Note: This implementation is a temporary placeholder to allow bootstrapping of the Abbott OAuth client workflow. Will need to migrate this to environment variables and add minimal authorization. For now, though, this is acceptable since it isn't revealing anything that is not already available in other locations (i.e. other public repos).

TODO: https://tidepool.atlassian.net/browse/BACK-3394

[ewollesen]

That's a lot of URLs / data to put in an env variable. I wonder if it shouldn't be a in a file, eventually that is.

As a temporary measure, it seems fine though.

[darinkrauss]

Thanks. Where would we put the file? I'd like to put it in the infrastructure somewhere so it can be easily configured per environment. I'm probably missing something obvious.

[jh-bate]

LGTM