perf: reduce type instantiations on route matching

[KazariEX]

🔗 Linked issue

fix nuxt/nuxt#33735

❓ Type of change

• 📖 Documentation (updates to the documentation, readme, or JSdoc annotations)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Here are the tsc diagnostic results with 200 API routes:

before	after

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[vercel]

@KazariEX is attempting to deploy a commit to the Nitro Team on Vercel.

A member of the Team first needs to authorize it.

[pi0]

Can you please rebase it against v2 branch and make sure has no breaking changes? 🙏

[autofix-ci]

Hi! I'm autofix.ci, a bot that automatically fixes trivial issues such as code formatting in pull requests.

I would like to apply some automated changes to this pull request, but it looks like I don't have the necessary permissions to do so. To get this pull request into a mergeable state, please do one of the following two things:

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2. Manually fix the issues identified for your pull request (see the GitHub Actions output for details on what I would like to change).

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/nitrojs/nitro/nitropack@3810

commit: d116bea