feat: foudations for migration from prettier

[ematipico]

Summary

This PR sets the foundation for the future command biome migrate --prettier.

This PR creates the data structure that mimics the prettier configuration and its deserialisation, and it converts it to the Biome configuration.

Test Plan

Added a couple of tests. CI should pass

[netlify]

✅ Deploy Preview for biomejs ready!

Name	Link
🔨 Latest commit	464f8b1
🔍 Latest deploy log	https://app.netlify.com/sites/biomejs/deploys/65a256ac6c604800089883f5
😎 Deploy Preview	https://deploy-preview-1545--biomejs.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
Lighthouse	1 paths audited Performance: 100 (🟢 up 1 from production) Accessibility: 97 (no change from production) Best Practices: 100 (no change from production) SEO: 93 (no change from production) PWA: - View the detailed breakdown and full score reports

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[codspeed-hq]

CodSpeed Performance Report

Merging #1545 will degrade performances by 38.32%

_{⚠️ No base runs were found}

_{Falling back to comparing feat/migrate-prettier (464f8b1) with main (cf3434c)}

Summary

⚡ 1 improvements
❌ 2 (👁 2) regressions
✅ 90 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	feat/migrate-prettier	Change
👁	big5-added.json[uncached]	2.9 ms	4.6 ms	-38.32%
👁	eucjp.json[cached]	4.3 ms	4.7 ms	-9.23%
⚡	db.json[cached]	76.4 ms	71.7 ms	+6.51%