Aggregated claims

[schanzen]

All Submissions:

• Have you followed the plugin Contributing guideline?
• Does your code follow the WordPress' coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

This pull request should fix #254. However, it does not fully implement the spec.

How to test the changes in this Pull Request:

1. Get (most) claims inside a JWT from "_claim_sources" referenced by "_claim_names"
2. See that the user gets correctly added to the DB

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully run tests with your changes locally?

Changelog entry

Support OIDC Aggregated Claims.

[timnolte]

@schanzen FYI, this PR is failing due to coding standards and static analysis failures. Please address these and then I'll take another look at this PR. Thanks!

[schanzen]

@schanzen FYI, this PR is failing due to coding standards and static analysis failures. Please address these and then I'll take another look at this PR. Thanks!

Ok fixed!