Add new features in set 3 and set 2 pipelines

[ninanikitina]

Add:

• Curvature of medial and lateral cartilages
• Label cartilage “Healthy” or “Damaged"
• Femur gap distance

To:

• patients_data_loading_set2.ipynb

• patients_data_loading_set3.ipynb

[ninanikitina]

Timing: ~30 min