User sees the percentage of correct and incorrect answers submitted for each graded and ungraded problem

[crathbun428]

User Story
As a course author, I want to the percentage of correct and incorrect answers submitted for each graded and ungraded, so that I can see how learners are doing and gauge the difficulty level of the problems in my course.

Acceptance Criteria
Scenario: A course author can view the percentage of correct and incorrect responses submitted for each problem in their course
Given I am a course author
When I view the performance section of the course dashboard
Then I see the percentage of correct and incorrect answers submitted for each graded and ungraded

[SoryRawyer]

I think this can be charted using the fact_problem_responses dataset in Superset.