Implement a CFG

[u9g]

close: #368

[codspeed-hq]

CodSpeed Performance Report

Merging #1805 will degrade performances by 36.9%

_{Comparing cfg (a896631) with main (ead4e8d)}

Summary

❌ 6 regressions
✅ 8 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	cfg	Change
❌	transformer[antd.js]	1.7 s	2.2 s	-21.75%
❌	semantic[checker.ts]	545.9 ms	759.6 ms	-28.13%
❌	transformer[checker.ts]	1.1 s	1.4 s	-20.4%
❌	semantic[pdf.mjs]	128 ms	202.9 ms	-36.9%
❌	transformer[pdf.mjs]	289.1 ms	383.8 ms	-24.68%
❌	semantic[antd.js]	702.7 ms	1,047 ms	-32.88%

[Boshen]

Merged with #2019

This branch will be kept for references.