Add server's Script helper option to specify whether to wrap in HasIsland or not

[yvvki]

What is the feature you are proposing?

I am using my own renderer using HTMX inside my client. However, following the BYOR guide is a bit verbose to fix the generated client script path. I think it's better for the Script helper to have an option to bypass the HasIsland wrapper, making it always available inside the renderer. Right now I copied the helper to support the default generated path using the Vite manifest with the removed HasIsland.

It would be appreciated if this feature is natively supported.