Add support for "default of credit card clients Data Set"

[anupamamurthi]

https://archive.ics.uci.edu/ml/datasets/default%2Bof%2Bcredit%2Bcard%2Bclients

Potential Tasks:

• [ ] Ensure the license permits open source us
• [ ] Verify that this dataset is appropriate for fairness tasks and subset it accordingly (removing un-necessary columns etc.)
• [ ] Ensure we have instance level records with protected attributes and outcomes
• [ ] First create sklearn-compatible dataset (dataframe) and an appropriate "classic" dataset (second priority)
• [ ] Create a simple notebook where the dataset is consumed and simple fairness measures and computed at least.
• [ ] DO NOT download and incorporate the data, rather include a function that will do this since data is not hosted in AIF360.