Create the borderStyle of inferred links lazily (PR 19110 follow-up)

Given that most inferred links will overlap existing LinkAnnotations, creating a lot of unused `borderStyle` objects seem unnecessary.
Hence we can move that into the `AnnotationLayer.prototype.addLinkAnnotations` method instead, which also allows us to slightly reduce the API-surface.

src/display/annotation_layer.js

@@ -3254,6 +3254,8 @@ class AnnotationLayer {
       parent: this,
     };
     for (const data of annotations) {
+      data.borderStyle ||= AnnotationLayer._defaultBorderStyle;
+
       elementParams.data = data;
       const element = AnnotationElementFactory.create(elementParams);
 
@@ -3329,6 +3331,24 @@ class AnnotationLayer {
   getEditableAnnotation(id) {
     return this.#editableAnnotations.get(id);
   }
+
+  /**
+   * @private
+   */
+  static get _defaultBorderStyle() {
+    return shadow(
+      this,
+      "_defaultBorderStyle",
+      Object.freeze({
+        width: 1,
+        rawWidth: 1,
+        style: AnnotationBorderStyleType.SOLID,
+        dashArray: [3],
+        horizontalCornerRadius: 0,
+        verticalCornerRadius: 0,
+      })
+    );
+  }
 }
 
 export {

src/pdf.js

@@ -24,7 +24,6 @@
 
 import {
   AbortException,
-  AnnotationBorderStyleType,
   AnnotationEditorParamsType,
   AnnotationEditorType,
   AnnotationMode,
@@ -92,7 +91,6 @@ if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("TESTING || GENERIC")) {
 
 export {
   AbortException,
-  AnnotationBorderStyleType,
   AnnotationEditorLayer,
   AnnotationEditorParamsType,
   AnnotationEditorType,