Wrangler - Normalizing Cols with Multiple Vals per Record

[JVonderwell]

Attributes will sometimes consist of records that are a list of values e.g. PHARM_CLASSES for a record might contain: Radioactive Diagnostic Agent [EPC], Antiarrhythmic [EPC], ...

The wrangler normalizes them collectively as though they were one string. We should add an option to split independent values and normalize them separately.

Benefit: More effective normalization for certain types of attributes.

Cost: Ballparking at 3 hours for development and testing.