Set the parentPath property when creating a document with FileImporter

To comply with our documentation https://doc.nuxeo.com/nxdoc/understand-expression-and-scripting-languages-used-in-nuxeo/#event-handlers the "parentPath" should be passed to the options of the document creation when it's done through the FileImporter.

This way, "parentPath" will be among the context property of the event "emptyDocumentModelCreated"