Add Containers as they work in Specify 6

[grantfitzsimmons]

Containers should be implemented as they are currently in Specify 6 for review. This is the first part of a multi-step process to achieving #1150, which will be our final implementation for containers in GeoSpecify. This is for internal testing and evaluation before moving ahead.

Currently Container is only half-baked in Specify 7, lacking the plugin on the Collection Object form that Specify 6 has.

It is also missing the plugin on the Container form that allows the user to dictate which Collection Object within a container is the "owner" of the container.

https://geology-edge.test.specifysystems.org/specify/view/collectionobject/new/

My breakdown of Container in Specify 6 is available internally here

As I currently see it, no database schema changes are required to make this functional.