LibWeb: Support [de]serialization for Error objects

Author: https://github.com/IdanHo
Commit: 1d24e08934
Pull-request: https://github.com/SerenityOS/serenity/pull/21895

Tests/LibWeb/Text/input/HTML/StructuredClone-object-primitives.html

@@ -9,6 +9,8 @@
         println(structuredClone(BigInt("0x1fffffffffffff")));
         println(structuredClone(Date.UTC(2023, 7, 23)));
         println(structuredClone(/abc/gimsuy));
+        println(structuredClone(new Error()));
+        println(structuredClone(new URIError("hello")));
 
         {
             let arrayBuffer = new ArrayBuffer(6);