perf: improve performance of eval-source-map

[JSerFeng]

Summary

using simd_json to convert string to json string, the improvement is small, but better than current, especially if the number of modules is super large.

encoding url always allocate new string, but in most cases there is no replacement at all, so using Cow to avoid unnessary allocation here.

here is the improvement I saw with my MacBook Pro M1, using this repo, CASE=9000

Before

After

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[JSerFeng]

!bench

[rspack-bot]

📝 Benchmark detail: Open

Name	Base (2024-08-20 46c0de9)	Current	Change
10000_development-mode + exec	2.36 s ± 21 ms	2.35 s ± 18 ms	-0.49 %
10000_development-mode_hmr + exec	703 ms ± 6.6 ms	710 ms ± 4.4 ms	+0.91 %
10000_production-mode + exec	3.02 s ± 31 ms	3.04 s ± 35 ms	+0.77 %
arco-pro_development-mode + exec	1.9 s ± 92 ms	1.94 s ± 60 ms	+2.30 %
arco-pro_development-mode_hmr + exec	437 ms ± 1.6 ms	437 ms ± 1.8 ms	-0.04 %
arco-pro_production-mode + exec	3.47 s ± 77 ms	3.48 s ± 54 ms	+0.24 %
arco-pro_production-mode_generate-package-json-webpack-plugin + exec	3.54 s ± 75 ms	3.58 s ± 44 ms	+1.08 %
threejs_development-mode_10x + exec	1.71 s ± 10 ms	1.72 s ± 20 ms	+0.39 %
threejs_development-mode_10x_hmr + exec	816 ms ± 6.3 ms	820 ms ± 8.3 ms	+0.45 %
threejs_production-mode_10x + exec	5.55 s ± 44 ms	5.56 s ± 19 ms	+0.20 %