Add list_assignment_rubric_assessments() function to vvcanvas

[Copilot]

This PR implements the list_assignment_rubric_assessments() function to fetch all rubric assessments for a specific assignment in Canvas LMS.

Changes Made

New Function Implementation

• Function: list_assignment_rubric_assessments(canvas, course_id, assignment_id, style = NULL, per_page = 100)
• Endpoint: GET /api/v1/courses/:course_id/assignments/:assignment_id/rubric_assessments
• Features:
  • Automatic pagination handling with configurable per_page parameter
  • Optional style parameter for different assessment formats ("full", "comments_only", etc.)
  • Comprehensive error handling and status code validation
  • Progress messages during data retrieval
  • Returns data frame of rubric assessment objects

Documentation & Integration

• Roxygen2 Documentation: Complete function documentation with examples and parameter descriptions
• Manual Page: Created man/list_assignment_rubric_assessments.Rd
• NAMESPACE: Added function export
• pkgdown Integration: Registered function in _pkgdown.yml under "Assignments" section
• TODO.md: Marked feature as completed with proper endpoint documentation

Example Usage

# Authenticate with Canvas
canvas <- canvas_authenticate("your_api_key", "https://your-canvas-instance.com")

# Get all rubric assessments for an assignment
assessments <- list_assignment_rubric_assessments(canvas, 12345, 67890)

# Get rubric assessments with full style
assessments_full <- list_assignment_rubric_assessments(canvas, 12345, 67890, style = "full")

Implementation Details

The function follows existing vvcanvas package conventions:

• Consistent parameter naming and structure with other list_* functions
• Pagination pattern matching list_all_enrollment_terms()
• Error handling consistent with get_assignment_submissions()
• JSON parsing and data frame return format following package standards

Validation

• ✅ Function loads without syntax errors
• ✅ All required parameters present with correct defaults
• ✅ URL construction follows Canvas API pattern
• ✅ Pagination logic implemented correctly
• ✅ Documentation generated successfully
• ✅ Package integration complete

Fixes #28.

Warning

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• cran.rstudio.com
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• esm.ubuntu.com
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[tin900]

@copilot use the new paginate function see other functions how to use it

[Copilot]

@copilot use the new paginate function see other functions how to use it

Updated the function to use the new paginate() helper function instead of manual pagination, following the same pattern as other functions in the package. This makes the code more consistent and leverages the centralized pagination logic. (commit: 3710598)