WIP: vite-plugin-react-swc integration

[pcattori]

See vitejs/vite-plugin-react-swc#191

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[brophdawg11]

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[pcattori]

For React plugin to function correctly, we need to only create ?client-route virtual modules in production, not in development. Currently, the React plugin will only add React Refresh header/footer to files that define React components (which is correct), but the virtual modules re-export React components defined in their corresponding route modules. We used to manually inject React Refresh header/footer for these vmods too when we vendored/modified the React plugin.

?client-route vmods exist solely to guarantee same production-mode treeshaking from classic (esbuild-based) Remix compiler still happens when migrating to Remix Vite. Originally, I was opposed to having ?client-route vmods exist only in the prod module graph, but since they exist solely to power optimizations like treeshaking that only get applied in prod, its ok for that part of the module graph to be different. Especially since these vmods are one-liners that just re-export client-safe exports, so there isn't a bunch of complexity that could trip us up.