accessibility for sorting quiz questions

fixes CNVS-9048

test plan:
  - as a teacher
  - create a quiz with no question groups
  - use screenreader
    - you should find a 'move to' button near where the drag handle is
    - clicking this brings up a dialog
    - you should be able to use the dialog to reorder the questions

  - create a quiz with question groups
  - use the screenreader
    - you should find a 'move to' button for both groups/questions
    - clicking this brings up a dialog
    - you should be able to reorder both questions/groups
    - try moving items in any way you can think - outside/inside groups, etc

Change-Id: I065cac8a60f3652a75ce8154614133da4b6af5e9
Reviewed-on: https://gerrit.instructure.com/41381
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Josh Simpson <jsimpson@instructure.com>
QA-Review: Trevor deHaan <tdehaan@instructure.com>
Product-Review: Derek DeVries <ddevries@instructure.com>