Add support for enabling .mjs extension resolving

[timneutkens]

Description

Adds support for resolving .mjs files without the extension. This is something we do currently in Next.js.

Testing Instructions

[vercel]

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[timneutkens]

Current dependencies on/for this PR:

• main
  • PR Add support for enabling .mjs extension resolving #6525 👈

This stack of pull requests is managed by Graphite.

[github-actions]

🟢 Turbopack Benchmark CI successful 🟢

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[github-actions]

🟢 CI successful 🟢

Thanks

[github-actions]

✅ This change can build next-swc

[github-actions]

Linux Benchmark for 175b46d

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Test	Base	PR	%	Significant %
bench_hmr_to_commit/Turbopack CSR/1000 modules	23.66ms ± 0.94ms	24.34ms ± 0.71ms	+2.89%
bench_hmr_to_eval/Turbopack CSR/1000 modules	23.22ms ± 0.96ms	23.13ms ± 0.98ms	-0.36%
bench_startup/Turbopack CSR/1000 modules	1094.62ms ± 5.96ms	1076.80ms ± 7.87ms	-1.63%

[github-actions]

Linux Benchmark for a37fd74

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Test	Base	PR	%	Significant %
bench_hmr_to_commit/Turbopack CSR/1000 modules	24.10ms ± 0.70ms	24.14ms ± 0.67ms	+0.15%
bench_hmr_to_eval/Turbopack CSR/1000 modules	22.96ms ± 0.95ms	23.00ms ± 0.95ms	+0.17%
bench_startup/Turbopack CSR/1000 modules	1135.43ms ± 3.91ms	1131.66ms ± 13.71ms	-0.33%