PSI added to diff of numerical stat columns

[JGSweets]

Is your feature request related to a problem? Please describe. Within https://github.com/capitalone/DataProfiler/blob/main/dataprofiler/profilers/numerical_column_stats.py#L350 Need to add PSI - https://medium.com/model-monitoring-psi/population-stability-index-psi-ab133b0a5d42 Should be a helper function to calculate which is called withtin the def diff function.

Describe the outcome you'd like: receiving PSI in the diff command of NumericalStatsMixin Tests around the addition.

Additional context: