[impala] Toggle facet selection
[impala] Re-organized and added imports
[impala] Added other facet icons to draggables
[impala] Adding columns to dashboard
[impala] Added spinner on result widget
[impala] Add a new facet with drag and drop
[impala] Select the field from dropdown when creating a facet
[impala] New dashboard button
[impala] Added field filter on resultset widget
[impala] Hide an add widget button if the column has zero rows