feat: add onLinkOpen component prop (#4694)

Co-authored-by: ad1992 <aakansha1216@gmail.com>

src/types.ts

@@ -247,6 +247,12 @@ export interface ExcalidrawProps {
   onLibraryChange?: (libraryItems: LibraryItems) => void | Promise<any>;
   autoFocus?: boolean;
   generateIdForFile?: (file: File) => string | Promise<string>;
+  onLinkOpen?: (
+    element: NonDeletedExcalidrawElement,
+    event: CustomEvent<{
+      nativeEvent: MouseEvent | React.PointerEvent<HTMLCanvasElement>;
+    }>,
+  ) => void;
 }
 
 export type SceneData = {