Fix Promise implementation

[alshdavid]

Currently Promise is instantiated by calling into JavaScript and manually calling globalThis.Promise (as JavaScript).

https://github.com/alshdavid/ion/blob/main/crates/ion/src/values/js_promise.rs#L60

This is insecure and v8 provides APIs to do this. Replace the implementation with the native V8 Promise constructor

[abhilov23]

Hey @alshdavid , i would like to work on this?

[alshdavid]

Sounds great! Let me know if you have any questions 🙏