feat: allow use assets in webmanifest icons

[userquin]

It works if referenced via static import or directly in src attribute: example on vue-router on src/App.vue: check the docs here https://deploy-preview-397--vite-plugin-pwa-legacy.netlify.app/guide/static-assets.html#reusing-src-assets-images

The docs will go to old docs and the new ones, this PR on draft until finished.

On dev server with dev options enabled it just works, Vite will resolve the src/assets/xxx asset.

closes #211 and #396

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[userquin]

@antfu maybe we can have some problem with this on vite-ssg, since we're using it without the bundle param, I'll try to check it tmr on vitesse template.

EDIT: I'll check it also on îles, VitePress, SvelteKit and Astro integrations.

[userquin]

I need to test all integrations, a fast review just checking source code:

• vite-ssg: no problem, build module just regenerates the service worker
• îles: should check if it is required, we're regenerating the webmanifest (https://github.com/ElMassimo/iles/blob/main/packages/pwa/src/pwa.ts#L156)
• VitePress: no problem
• SvelteKit: no problem
• Astro: no problem

/cc @ElMassimo sorry to ping you directly, maybe you can upgrade the plugin to 0.13.1 and try commenting out previous line.

[userquin]

I Will try to emit the icon if missing from the bundle, I think we shouldn't add this behavior.

If ppl Just want to add the icons to the assets folder instead public folder and those icons not being used (vía static import or used directly in the src attr) we need to do here the work done by Vite, no makes sense.