inikulin / parse5 / 23637991517

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perf: use Uint8Array bitmaps for faster tag ID lookups (#1679)

Replace Set.has() with Uint8Array bitmap lookups for scope checking
and foreign content exit detection. Bitmap lookup is ~3-4x faster
than Set.has() for small integer keys like TAG_IDs.

Also adds SVG-specific benchmark for testing foreign content parsing
performance.

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