perf: improve exports info

[LingyuCoder]

Summary

• use UkeyMap to store exports infos
• just get named export info directly

Related links

Checklist

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

[netlify]

✅ Deploy Preview for rspack canceled.

Name	Link
🔨 Latest commit	c6ca683
🔍 Latest deploy log	https://app.netlify.com/projects/rspack/deploys/68b01dae2970820008012084

[github-actions]

📦 Binary Size-limit

Comparing c6ca683 to fix: code splitting incremental missing module to update (#11510) by Gengkun

🎉 Size decreased by 1.63KB from 47.59MB to 47.59MB (⬇️0.00%)

[codspeed-hq]

CodSpeed Performance Report

Merging #11524 will not alter performance

_{Comparing perf/improve-exports-info (c6ca683) with main (9e55f10)}

🎉 Hooray! codspeed-node just leveled up to 4.0.1!

A heads-up, this is a breaking change and it might affect your current performance baseline a bit. But here's the exciting part - it's packed with new, cool features and promises improved result stability 🥳!
Curious about what's new? Visit our releases page to delve into all the awesome details about this new version.

Summary

✅ 17 untouched benchmarks