Handle a list of multi-field delimited lists of category names in a single legacy_field when mapping organizations

The current implementation of category mapping does not allow you to supply categories to sub-delimited addresses, phone number, and email addresses when mapping organizations. For example (`<^>` is the multi-field delimiter):

| address_line1 | address_line2 | address_city | address_state_province | address_postal_code | address_categories |
|--------|--------|--------|--------|--------|--------|
| 123 N Main St.<^>Fulfillment Center | <^>Pier 13 | Springfield<^>San Francisco | MO<^>CA | 65807<^>94133 | [Payments, Billing, Orders, Custom Support]<^>[Shipping, Sales] |
| Accounts Payable<^>Returns Center | PO Box 12345<^>543 Copa Cabana Ave | Springfield<^>Miami | MO<^>FL | 65803<^>33101 | [Payments, Billing, Orders, Shipping]<^>[Custom Support, Sales, Returns] |

The tools should recognize the `[]`-wrapped lists as lists and iterate through them to map the category names to FOLIO reference data. This would better support mapping from Alma vendor data.