feat(css_formatter): Starting style at rule

[denbezrukov]

Summary

Formatting for a starting style at rule

Test Plan

cargo test

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[codspeed-hq]

CodSpeed Performance Report

Merging #2209 will degrade performances by 10.22%

_{Comparing feat/starting-style (dd140b9) with main (3fdf1ee)}

Summary

❌ 1 regressions
✅ 92 untouched benchmarks

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

Benchmarks breakdown

	Benchmark	main	feat/starting-style	Change
❌	big5-added.json[cached]	2.2 ms	2.4 ms	-10.22%

[denbezrukov]

close as a duplicate #2213