New/d2lintegration - Introduce D2L integration for grade transfer

[macite]

Description

This PR introduces front end components needed for the D2L integration. This allows staff to trigger login to D2L via oauth, and then use this token to post grades to the D2L grade book.

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Testing has occurred using local server and using the Deakin test D2L server.

Testing Checklist:

• Tested in latest Chrome
• Tested in latest Safari
• Tested in latest Firefox

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have requested a review from @macite and @jakerenzella on the Pull Request