test(nuxt): benchmark dev loadNuxt startup

[TheAlexLichter]

📚 Description

This PR adds a simple benchmark for loadNuxt with the dev setting enabled, making sure we can (somewhat) measure cold starts in Nuxt.

[pkg-pr-new]

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@nuxt/kit

npm i https://pkg.pr.new/@nuxt/kit@35382

@nuxt/nitro-server

npm i https://pkg.pr.new/@nuxt/nitro-server@35382

nuxt

npm i https://pkg.pr.new/nuxt@35382

@nuxt/rspack-builder

npm i https://pkg.pr.new/@nuxt/rspack-builder@35382

@nuxt/schema

npm i https://pkg.pr.new/@nuxt/schema@35382

@nuxt/vite-builder

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@nuxt/webpack-builder

npm i https://pkg.pr.new/@nuxt/webpack-builder@35382

commit: 1730808

[codspeed-hq]

Merging this PR will not alter performance

✅ 20 untouched benchmarks
🆕 1 new benchmark
⏩ 3 skipped benchmarks¹

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
🆕	loadNuxt in the basic test fixture (dev)	N/A	391 ms	N/A

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_{Comparing perf/dev-loadnuxt-benchmark (1730808) with main (2f9ee7b)²}

Footnotes

1. 3 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

2. No successful run was found on main (ed1e711) during the generation of this report, so 2f9ee7b was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩