Sakai JIRA SAK-48745 - LTI Context Groups (Part 3)

Adding support for the LTI C0ntext Groups specification to Sakai and Tsugi to auto-update LTI grades when grading an LTI tool in the Sakai Grader.

We will build the Sakai code, then build a test harness by extending the Tsugi LMSTest tool which can be used to test LTI 1.3 implementations:

This will take a while ans it is a whole new spec - so it will be a multi part recording.