DS-2336: Some enhancements regarding UI Batch Import (JSPUI)

Related JIRA: https://jira.duraspace.org/browse/DS-2336

This PR adds the following functionality in the JSPUI batch import feature:

1) support for batch import of Simple Archive Format via uploading a zip file

2) display a more explanatory message when batch import finishes successfully on where to find the list of batch imports

3) display items that were imported in the batch import list details (show/hide collapsible div)