feat(classroom): update the api

#### classroom:v1

The following keys were added:
- schemas.Course.properties.gradebookSettings.$ref (Total Keys: 1)
- schemas.CourseWork.properties.gradeCategory.$ref (Total Keys: 1)
- schemas.GradeCategory (Total Keys: 8)
- schemas.GradebookSettings (Total Keys: 6)

Author: yoshi-automation