[api-minor] Change the "dc:creator" Metadata field to an Array

- add scripting support for doc.info.authors
 - doc.info.metadata is the raw string with xml code

web/app.js

@@ -1655,7 +1655,8 @@ const PDFViewerApplication = {
           baseURL: this.baseUrl,
           filesize: this._contentLength,
           filename: this._docFilename,
-          metadata: this.metadata,
+          metadata: this.metadata?.getRaw(),
+          authors: this.metadata?.get("dc:creator"),
           numPages: pdfDocument.numPages,
           URL: this.url,
           actions: docActions,