Restructure benchmark release

Rename benchmark release layout to benchmark_splits and data

Update benchmark_data/train/video_progress_benchmark_file.json

Update benchmark_data/test_nonexpert_unseen/video_progress_benchmark_file.json

Update benchmark_data/test_nonexpert_seen/video_progress_benchmark_file.json

Update benchmark_data/test_expert_unseen/video_progress_benchmark_file.json

Update benchmark_data/test_expert_seen/video_progress_benchmark_file.json

Add benchmark_json/train/video_progress_benchmark_file.json

Add benchmark_json/test_nonexpert_unseen/video_progress_benchmark_file.json

Add benchmark_json/test_nonexpert_seen/video_progress_benchmark_file.json

Add benchmark_json/test_expert_unseen/video_progress_benchmark_file.json

Add benchmark_json/test_expert_seen/video_progress_benchmark_file.json

initial commit