feat: boost performance of getObjectDiff and getListDiff

[DoneDeal0]

BOOST PERFORMANCE OF getObjectDiff & getListDiff

• Rewrote getObjectDiff and getListDiff for maximum performance.
  Due to aggressive optimizations, the code is less readable, but the performance gain justifies the tradeoff.

• Added a benchmark comparing Superdiff with its main competitors.

• Updated several dev dependencies.

📊 BENCHMARK

Environment: Node.js 24.12.0 (LTS) • MacBook Pro M2 (2023, Sequoia 15.1) • 16GB RAM.

Method: Warm up runs, then each script is executed 20 times, and we keep the median time. To minimize garbage collection and cross‑benchmark interference, all scenarios are run individually. All benchmark scripts are included so you can reproduce the results locally.

List diff

Scenario	Superdiff	arr-diff	deep-diff
10k items array	1.84 ms	32.95 ms	4.74 ms
100k items array	17.43 ms	3363.15 ms	50.36 ms

Object diff

Scenario	Superdiff	deep-object-diff	deep-diff
10k flat object keys	2.27 ms	2.44 ms	39.37 ms
100k flat object keys	29.23 ms	31.86 ms	3784.50 ms
100k nested nodes	4.25 ms	9.67 ms	16.51 ms

👉 Despite providing a full structural diff with a richer output, Superdiff is the fastest. It also scales linearly, even with deeply nested data.

[github-actions]

🎉 This PR is included in version 3.2.0 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)

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