`clean_and_validate.py` script

[ttimbers]

This script should:

• take three arguments: data path to wdbc.data, data path to wdbc.names , path to write to
• step 1: read in wdbc.names and extract column names (this should be a function)
• step 2: read in wdbc.data and rename columns with column names from step 1 (this should be a function)
• step 3: clean by dropping ID column, relabelling class column labels (this should be in a function)
• step 4: validate data (using greatexpectations or just exceptions) (this should be a function)