Add arrange contents view that reads from DB

refs #6131

Add view that queries SIPArrange table and returns the entries and
directories for Javascript file-browser.  Add test for that function.
Update move with arrange functionality

refs #6131

Update move_within_arrange endpoint to expect the SIPArrange table and
adjust paths within that tables as needed.  Refactor moveHandler to have
fewer nested ifs, send correct information for SIPArrange table.
Require arrange paths to be inside /arrange/

refs #6131

Require arrange paths in SIPArrange to start with DEFAULT_ARRANGE_PATH, and
enforce that for arrange_contents and move_within_arrange.
Update originals view

refs #6131

Update where the originals pane gets its data from.  Archivematica handles
querying the SS for the correct location.