Improve performance and progress monitoring of WSDL Soap -> source importer
* ColumnsInfoPanel
* The add button's selection listener can take a while to add the column
and set the root path. This places this code inside a UiBusyIndicator
to at least show the user, the wizard is busy.
* The add button's selection listener uses the initializing flag to
prevent the rootPathText field's modify listener from refreshing the
wizard page. It is time-consuming and unnecessary since
detailsPage.createResponseColumn() refreshes anyway.
* WsdlOperationsPanel
* Since reading a WSDL can be time-consuming uses the UiBusyIndicator to
show the user the wizard is busy.
TEIIDDES-1376 - Add Progress Monitor to WSDL to Source Importer for
Longer Tasks