Return parsed values of AuthnRequest to get attributes like ForceAuthn

[avinashdhinwa]

Issue: #7

All Submissions:

• [x] Have you followed the guidelines in our Contributing document?
• [x] Have you checked to ensure there aren't other open Pull Requests for the same update/change?

New Feature Submissions:

1. [ ] Does your submission pass tests?
2. [x] Have you lint your code locally prior to submission?

Changes to Core Features:

• [ ] 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 core changes, as applicable?
• [ ] Have you successfully ran tests with your changes locally?

[mayankagwl]

@avinashdhinwa Great Work! LGTM