refactor(biome_js_parser/state): use enumflags2 for SignatureFlag and ParsingContextFlag

[Javimtib92]

Summary

Part of #3157

Adds enumflags2 to biome_js_parser SignatureFlag and ParsingContextFlag

Test Plan

I ran cargo t on the root and all tests passed. Current CI should pass

[codspeed-hq]

CodSpeed Performance Report

Merging #3800 will degrade performances by 6.82%

_{Comparing Javimtib92:refactor/js-parser-state (2742c8a) with main (b1d55ff)}

Summary

❌ 1 regressions
✅ 106 untouched benchmarks

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

Benchmarks breakdown

	Benchmark	main	Javimtib92:refactor/js-parser-state	Change
❌	pure_9395922602181450299.css[cached]	3.4 ms	3.6 ms	-6.82%