feat: move pack logic to a web worker

[userquin]

Caution

I need to do some check about CORS when the web worker requires to fetch data from Iconify API

DONT MERGE YET 🙏 Looks like it is working 😍

Description

This PR adds a web worker moving all packing logic from main thread to the worker thread:

• transfers the collections via ArrayBuffer to the web worker from main thread
• moves all svg manipulation to src/utils/svg folder, exporting all helpers functions as a barrel: updated all static imports to use the barrel
• updates all the VUE components using the old src/utils/pack and src/utils/icons modules to provide the proper collections: all collections or using the target collection
• we need to figure out how to create the SVG Sprite, the logic still runing at main thread: maybe we can use the logic in this UnoCSS PR feat(preset-icons): Add CSS SVG Sprite support unocss/unocss#2675

supersedes #365

Linked Issues

Additional context

Including the new web worker (IconesPackWorker) adds an small chunk ~35KB

build output comparision with current version and using the web worker

IconesPackWorker in the devtools

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[userquin]

Looks like it is working, IIRC the service worker hacking also some CORS headers (https://github.com/antfu-collective/icones/blob/main/src/sw.ts#L23-L38):

removing the svg to force fetching the icon from Iconify API

service worker intercepting collection api call

network tab at devtools