Alternative mechanism to get generated server URL than events

[gregpalaci]

Working in embedded webviews it's difficult to get events as they are overwritten (in my case)
I would be nice to have an alternative to server-ready event

	webcontainerInstance.on("server-ready", (port: any, url: string) => {
			webc.value = url;
		});

If it was on the instance somewhere rather just await npm start should be sufficent to know the server is running.

await webcontainerInstance
			.spawn("npm", ["run", "start"])
			.then((deets) => {
				webc.value = "http://localhost:3111"; // or deets.url ?
			})
			.catch((e: any) => console.log(e));

or webcontainerInstance.url