feat: prevent FOUC with SSR in dev

[Julien-R44]

this PR fix the FOUC that happens when you're in dev mode and using SSR

implementation is quite simple. Vite maintains a graph module that lets you know the relationships between different files. this graph module lets us know which file imports which other file. so, from a file URL, we can browse the graph to find out which CSS files have been imported. here are the different steps :

• first, retrieve the client-side entry point (usually /resources/app.ts ) via Vite's graph module.
• from this entry point, we also retrieve the component of the page that will be rendered
• we now have both modules, the entrypoint and the page.
• for these two modules, we recursively browse the module graph to find all of their CSS imports
• we now have the list of CSS that will be imported. We generate <link> tags that we inject into the head of the page rendered in SSR.

no more FOUC as CSS is loaded immediately before JS !