[spike] Investigate Modal Presentation Patterns w/ Regards to Contexts

[tbiethman]

Spike

The ModalManager's current design can be difficult for applications that rely heavily on Contexts for data/state management. There is no guarantee that the Contexts available to the component presenting the modal will be available to the presented modal's contents. This becomes hard for our consumers to manage in a consistent way, especially within highly-composed applications.

We need to investigate whether or not alternative designs could make this more consumer-friendly. If that's not possible, we need to fully document our expectations with these workflows.