refactor(parser): Update lexer methods to handle only ASCII identifiers

[denbezrukov]

Summary

We don't need to track non-ASCII chars since all our keywords are ASCII.

Adjusted the methods consume_ident_sequence and consume_and_get_ident in the biome_css_parser's and biome_js_parser's lexer modules, to return an additional boolean indicating whether only ASCII characters were used. This change will improve handling of non-ASCII identifiers in CSS and JS parsing, providing a more accurate classification of identifiers.

Test Plan

CI

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[github-actions]

Parser conformance results on

js/262

Test result	main count	This PR count	Difference
Total	49701	49701	0
Passed	48721	48721	0
Failed	980	980	0
Panics	0	0	0
Coverage	98.03%	98.03%	0.00%

jsx/babel

Test result	main count	This PR count	Difference
Total	40	40	0
Passed	37	37	0
Failed	3	3	0
Panics	0	0	0
Coverage	92.50%	92.50%	0.00%

symbols/microsoft

Test result	main count	This PR count	Difference
Total	6322	6322	0
Passed	2036	2036	0
Failed	4286	4286	0
Panics	0	0	0
Coverage	32.20%	32.20%	0.00%

ts/babel

Test result	main count	This PR count	Difference
Total	662	662	0
Passed	592	592	0
Failed	70	70	0
Panics	0	0	0
Coverage	89.43%	89.43%	0.00%

ts/microsoft

Test result	main count	This PR count	Difference
Total	17646	17646	0
Passed	13452	13452	0
Failed	4192	4192	0
Panics	2	2	0
Coverage	76.23%	76.23%	0.00%

[codspeed-hq]

CodSpeed Performance Report

Merging #1558 will not alter performance

_{⚠️ No base runs were found}

_{Falling back to comparing refactor/lexer-ascii (aca8cb4) with main (593da22)}

Summary

✅ 93 untouched benchmarks