Delete 04-data-leakage.md

Create problem statement for data leakage detection

Create documentation for data leakage detection challenge

Add problem statement for data drift detection

Create outlier detection problem statement

Add moving average problem description for heart rate data

Delete problems/moving_average.md

Add moving average problem description

Create 01-normalizer.md

Delete problems/normalizer.md

Create normalizer.md for health data normalization

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