Add the ability for the export/import process to be completed in two phase, a preparation phase and an execution phase.

Currently, when a user exports a LAR file, a summary of the type and amount of content that will be exported is not provided. Once the user begins the export process, the user is unaware of the status of the export and is not provided information on the progress.

After this feature is implemented, when a user selects to export a site, the user sees a preview of what will be exported before making the decision to export. When user confirms to export, the user has the ability to view the export progress. Upon completion of export, portal provides a link to designated user / group to download the exported file.

This feature will also improve how publication is done from staging since under the hood it is an export and an import of its pages and content.