LibWeb: Implement TransformStream transfer

Author: https://github.com/trflynn89
Commit: 95fc0a8070
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4828
Reviewed-by: https://github.com/shannonbooth ✅

Libraries/LibWeb/HTML/StructuredSerialize.h

@@ -51,6 +51,7 @@ enum class TransferType : u8 {
     ResizableArrayBuffer = 3,
     ReadableStream = 4,
     WritableStream = 5,
+    TransformStream = 6,
 };
 
 WebIDL::ExceptionOr<SerializationRecord> structured_serialize(JS::VM& vm, JS::Value);