prototyping fused boundary table for branchless loop

[cometkim]

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[codspeed-hq]

Merging this PR will not alter performance

✅ 12 untouched benchmarks

---

_{Comparing bnd-table (d8295ab) with main (a6b246a)}

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commit: d8295ab

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commit: c1beded

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (a6b246a) to head (d8295ab).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #137   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           11        11           
  Lines         1005      1007    +2     
=========================================
+ Hits          1005      1007    +2     

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[cometkim]

This grows the pre-allocated memory size but provides no noticeable improvement.

The indirect effect is that it further compacts the main loop, reverting the #135 change, and the countGraphemes() and splitGraphemes() APIs become simple enough that each can have its own loop.

[cometkim]

256 bytes -> 8192 bytes pre-allocated memory, runs almost back to the memory usage allocated in v14.1 (8.5KB) - v14.4 (7.4KB).

It's worth the cost if there are significant advantages in terms of code size or performance.

However, the current library is already compacted very well, and most duplicate code is automatically removed after compression. Smaller code can actually become larger after compression.

I need to check other platforms additionally in terms of performance. Such as Safari and Firefox.