Implement JavaScript and postMessage via IPC

[codewithbobb]

Your library is great!
How can I implement JavaScript in the browser and receive postMessage via IPC, similar to Wry?

[LegitCamper]

The underlying ultralight library ul-next has a JavaScript api. If you get it implemented id love to merge it. https://docs.rs/ul-next/latest/ul_next/javascript/index.html

You can implement this in /src/engines/ultralight.rs and expose it in /src/engines.rs