Courses endpoint with pagination

[marcospri]

For:

• https://github.com/hypothesis/lms/issues/6393

Expose a API endpoint to list courses with pagination.

The intended use case is to list the courses in a drop down menu or similar to allow for filtering.

Example response

http://localhost:8001/api/dashboard/courses?limit=2

{
  "courses": [
    {
      "id": 1883,
      "title": "Copy of Developer Test Course with Sections Enabled (With Pags)"
    },
    {
      "id": 1829,
      "title": "Course copy LTI1.3"
    }
  ],
  "pagination": {
    "next": "http://localhost:8001/api/dashboard/courses?cursor=%5B%22Course+copy+LTI1.3%22%2C+1829%5D&limit=2"
  }
}

Testing

• Make sure you have an authorization cookie from the LMS admin pages visiting http://localhost:8001/admin/
• Open http://localhost:8001/api/dashboard/courses
• Play with the limit parameter, eg: http://localhost:8001/api/dashboard/courses?limit=1
• Follow the next parameter in the response.

[marcospri]

Removed the base64-ing of the cursor

Also added the right type annotation to the method that build the pagination parameters. It doesn't takte a list of courses but rather a queryset (just Query[Course] in SQLA)