Research accessibility considerations for Data Type list drag-n-drop.

Use Case: As a DMN user I will want to be able to reorder the list of Custom data types so that I can arrange data types in a logical order.

Notes:

• The Data Type dialog leverage the following PR list pattern:
  https://www.patternfly.org/pattern-library/content-views/tree-list-view
• The list will need to be re-orderable, there is an open design jira to determine the interaction options for that feature.
• Design is currently being iterated upon, but last iteration wireframes are posted at: https://redhat.invisionapp.com/share/B7NEEUSV539

Verification conditions:

• Research results summarized in the jira or a linked google doc., etc.