Summary:
Implement function to retrieve course-level student summary analytics (participation, page views, submissions, etc).

What to implement:

• Function: get_course_analytics_student_summaries(course_id, ...)
• Endpoint: GET /api/v1/courses/:course_id/analytics/student_summaries
• Optional params:
  • sort_column (character; e.g., "name", "participations", "page_views")
  • student_id (character or integer; for filtering a specific student)
  • Pagination (as appropriate)
• Returns: Dataframe/list with per-student analytics and max values for benchmarking.

Design notes:

• Match return structure of other analytics functions.
• Clearly document sort/filter options.
• Usage example in Roxygen docs with API endpoint link.

To update:

• Add entry to TODO.md
• Add to _pkgdown.yml under "Analytics"