Optimize using precomputed lookup table for BMP characters

[cometkim]

Accept GPT-OSS-120B's suggestion from #93

[changeset-bot]

🦋 Changeset detected

Latest commit: 1d03edb

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
unicode-segmenter	Patch

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (b351f2a) to head (1d03edb).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #97   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           10        10           
  Lines          900       908    +8     
=========================================
+ Hits           900       908    +8     

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[codspeed-hq]

CodSpeed Performance Report

Merging #97 will improve performances by 28.96%

_{Comparing precompute-bmp (1d03edb) with main (b351f2a)}

Summary

⚡ 3 improvements
✅ 3 untouched benchmarks

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	grapheme - Code snippet (combined)	239 µs	212.5 µs	+12.44%
⚡	grapheme - Hindi	86.8 µs	67.3 µs	+28.96%
⚡	grapheme - Tweet text (combined)	120.4 µs	102.7 µs	+17.19%