TODO: move to overflow?.

Create a hash from the given ids and salt using '-' as the placeholder between salt an ids and , as the separator between ids.

/ Read a io.Reader as a map of id field to propertyBag.

/ Read a filename.csv as a map of id field to propertyBag.

A Metadata csv field is a excel/csv file that has one field that should be key and the others should be values, this method will return a map of rowKey -> { columHeader : rowValue}.