create hot-reloading example(s)

[RayMarch]

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There should be an example crate that shows how to set up hot-reloading. Maybe even 2 crates

• [ ] hot reloading via a separate binary crate that sends the generated pipeline over to a running "engine" process that owns the window.
• [ ] hot reloading via something like https://github.com/DioxusLabs/dioxus/tree/main/packages/subsecond