feat: upgrade to Vite 3.1.0

[userquin]

This PR includes:

• migrate to Vite 3.1.0
• added packages for new core (just empty and configure to use unbuild) and vite-plugin-pwa
• updated all dependencies with taze major -r -w
• updated docs to use the latest VitePress: using the buildEnd hook to build the pwa
• included new sequential closeBundle hook on build plugin with default order: will help to configure the new SvelteKit
• tested all examples with prompt strategy except sveltekit that should be removed from the examples folder: react/preact/solid/svelte/vue

/cc @antfu I change the name of plugin in the root package.json with @vite-pwa: you should review all the scripts in the new vite-plugin-pwa package.

DON'T FORGET TO REVIEW THE RELEASE SCRIPTS

/cc @benmccann

superseded by #371

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[userquin]

@antfu review the types please

EDIT: you can check the integration here https://github.com/userquin/pwa-sveltekit-vite (the adapter fails, we need to update the kit version to latest, failing on my local running the posinstall script)

/cc @benmccann

[userquin]

we can close this PR