Enhance numerical stability and scoring accuracy for datasets with identical features
- Adjust minimum median values to 100x machine epsilon to prevent unstable operations.
- Implement specific scoring logic for outlier and near-duplicate issues in datasets with identical features, ensuring correct scores are assigned in such edge cases.
- Introduce unit tests to validate the expected behavior for datasets comprising entirely identical examples. Check an additional case with an extra unique example.
Related to issue #1055.
Ulyana