process static assets in parallel

[tirojal]

Environment

nuxt 3.18.1 -> nitro 2.12.4

Reproduction

Describe the bug

During ivestigation why my nuxt project build takes about 7 min on nitro step i found that nitro resolves public-assets-data by iterating over nitro.options.output.publicDir files one by one
See:
#nitro-internal-virtual/public-assets-data (v2) (src/rollup/plugins/public-assets.ts)
and/or
#nitro/virtual/public-assets-data (v3) (src/build/virtual/public-assets.ts)

for nuxt project it processes every file in /.nuxt/dist/client/_nuxt and it takes about 0.3 seconds per file. In my project, I have about 650 files, so it takes ~3 minutes to finish.

So i made local patch to batch processing of files, see my comment in:
nuxt/nuxt#31836 (comment)

Additional context

Logs

[pi0]

Nice find! We have an internal runParallel utility also in nitro to make it easier.

Feel free to work on PRs (we need two for v2 and main)

[tirojal]

PRs done
v2: #3910
main: #3911