perf(es/fast-lexer): Optimize lexing of keywords

[kdy1]

Description:

This PR adds a fast lookup table for keyword lexing.

[changeset-bot]

⚠️ No Changeset found

Latest commit: ddd3128

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[codspeed-hq]

CodSpeed Performance Report

Merging #10155 will improve performances by 3.04%

_{Comparing kdy1/fl2 (ddd3128) with main (65d23fe)}

Summary

⚡ 2 improvements
✅ 150 untouched benchmarks

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	es/fast-lexer/backbone	1.3 ms	1.3 ms	+3.04%
⚡	es/fast-lexer/mootools	5.5 ms	5.3 ms	+3.02%