[Editor] Add the parent tag id (if any) to the serialized editors (bug 1845087)

The tag id will be useful in order to update the StructTree when saving
the pdf.

src/display/editor/annotation_editor_layer.js

@@ -409,7 +409,7 @@ class AnnotationEditorLayer {
       }, 0);
     }
 
-    this.#accessibilityManager?.moveElementInDOM(
+    editor._structTreeParentId = this.#accessibilityManager?.moveElementInDOM(
       this.div,
       editor.div,
       editor.contentDiv,

src/display/editor/editor.js

@@ -80,6 +80,7 @@ class AnnotationEditor {
     this.annotationElementId = null;
     this._willKeepAspectRatio = false;
     this._initialOptions.isCentered = parameters.isCentered;
+    this._structTreeParentId = null;
 
     const {
       rotation,

src/display/editor/freetext.js

@@ -735,6 +735,7 @@ class FreeTextEditor extends AnnotationEditor {
       pageIndex: this.pageIndex,
       rect,
       rotation: this.rotation,
+      structTreeParentId: this._structTreeParentId,
     };
 
     if (isForCopying) {

src/display/editor/ink.js

@@ -1199,6 +1199,7 @@ class InkEditor extends AnnotationEditor {
       pageIndex: this.pageIndex,
       rect,
       rotation: this.rotation,
+      structTreeParentId: this._structTreeParentId,
     };
   }
 }

src/display/editor/stamp.js

@@ -506,6 +506,7 @@ class StampEditor extends AnnotationEditor {
       rect: this.getRect(0, 0),
       rotation: this.rotation,
       isSvg: this.#isSvg,
+      structTreeParentId: this._structTreeParentId,
     };
 
     if (isForCopying) {