Add a method goToXY in PDFLinkService in order to scroll the document at a given location

This function is required for the commenting feature: the user will be able to click
on a comment in the sidebar and the document will be scrolled accordingly.

web/interfaces.js

@@ -73,6 +73,14 @@ class IPDFLinkService {
    */
   goToPage(val) {}
 
+  /**
+   * Scrolls to a specific location in the PDF document.
+   * @param {number} pageNumber - The page number to scroll to.
+   * @param {number} x - The x-coordinate to scroll to in page coordinates.
+   * @param {number} y - The y-coordinate to scroll to in page coordinates.
+   */
+  goToXY(pageNumber, x, y) {}
+
   /**
    * @param {HTMLAnchorElement} link
    * @param {string} url

web/pdf_link_service.js

@@ -239,6 +239,20 @@ class PDFLinkService {
     this.pdfViewer.scrollPageIntoView({ pageNumber });
   }
 
+  /**
+   * Scrolls to a specific location in the PDF document.
+   * @param {number} pageNumber - The page number to scroll to.
+   * @param {number} x - The x-coordinate to scroll to in page coordinates.
+   * @param {number} y - The y-coordinate to scroll to in page coordinates.
+   */
+  goToXY(pageNumber, x, y) {
+    this.pdfViewer.scrollPageIntoView({
+      pageNumber,
+      destArray: [null, { name: "XYZ" }, x, y],
+      ignoreDestinationZoom: true,
+    });
+  }
+
   /**
    * Adds various attributes (href, title, target, rel) to hyperlinks.
    * @param {HTMLAnchorElement} link