Add CoreBoxItem builder UI (via React)

[maebeale]

• Each AbuseType has "CoreBoxItems", or, InventoryTypes that should be added to Boxes by default (once we create a Box)
• We want to have a CoreBoxItem builder that is basically the same as BoxDesign -- where we're adding InventoryTypes to a list, but the underlying data created is different
• Instead of adding BoxItems (InventoryTypes) to a Box, we'd be creating new CoreBoxItems
• We want the UI to have a toggle at the top of the page that allows the user to view one AbuseType at a time, or, all of them in inline columns (for easy cross-comparing)

[maebeale]

CoreBoxItem == many-to-many AbuseType/InventoryType

[Tanzi11]

@maebeale this is where I think I can help :)

[maebeale]

@Tanzi11 WOO HOOOO!!! happy to chat/talk/zoom whatever about this as needed.

[maebeale]

@seanmarcia and others have done some work on the BoxDesign feature, so feel free to check out that issue/thread/code and/or we'd love feedback back on how you solve this so we can apply backward

Here's some work in progress that might be useful to check out: https://github.com/cndreisbach/voices-of-consent/tree/box-design-form