Product Kit

As an administrator I want to be able to define a Kit which is a Product (Orderable) that consists of other Products so that I may supply kits through the supply chain and unpack their parts into inventory when needed.

AC:

• The Product model is updated to allow for a definition of a kit, where a kit is a Product (Orderable) that contains references to other products and their quantities in the kit.

• Update the product model documentation, API & docs, diagrams, etc

• Use GS1 GTIN attribute names where possible