Customers: support for business profiles

[joshsadler]

Our customer object is fantastic at representing individuals but falls a little short when representing businesses.

Project definition: https://www.notion.so/moovfinancial/11e09ccea0e240b18cd2e1a5337e75f9?v=1880828a5afa47d6b402c233413deb87&p=6dd497dab88244099e799ffc0bdc077d

Note that aspects of the Customer model are used in generated ACH files, so those areas need to be updated as well. @adamdecaf may have a better accounting of what other areas of the system will need updated.