Benchmark Parquet implementations against latest hyparquet

[ibgreen]

Goals

• Keep loaders.gl Parquet performance comparisons pinned to the latest verified hyparquet release.
• Measure the loaders.gl TypeScript decoder, the default parquet-wasm backend, and hyparquet with equivalent in-memory object-row workloads.
• Make the comparison reproducible through the existing benchmark command.

Stack position: #3461 → this PR. The PR targets codex/native-decompression-stream-support; compared with master, it builds on that native-decompression tranche and adds the benchmark changes below.

Actual changes

• Replace the two-backend smoke benchmark with grouped cross-implementation scenarios for LZ4_RAW, Hadoop LZ4, DELTA_BYTE_ARRAY, and projected columns.
• Label the comparator as the exact latest verified version, hyparquet 1.27.1, and use hyparquet-compressors 1.1.1.
• Preload input bytes and loader implementations outside timed callbacks.
• Warm each implementation twice, validate common row counts, and require at least five measured iterations.
• Keep existing Arrow and GeoParquet benchmarks.
• Remove the redundant ts-node/esm loader registration that conflicted with the benchmark loader.

Validation

• yarn lint fix
• yarn test bench parquet
• yarn test-node test/bench-loader.node.spec.ts
• yarn build
• yarn test-node
• yarn test-headless
• git diff --check

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Add TSDoc to the mock stream class

This introduces a new MockDecompressionStream class (with new readonly fields) without TSDoc; the repo's documented style guidance requires TSDoc on every new class, function, method, and field, so this test helper should get class/field docs before merge.

AGENTS.md reference: AGENTS.md:L33-L33

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