take() on VarBin returns VarBinView

[myrrc]

take() on VarBin returned a VarBin which was slow because referenced bytes were
copied. However, FSST version requires this. Make take() return VarBinView but
keep the old version for FSST.

Add a take benchmark for VarBin

Resolves: #4964

[codspeed-hq]

Merging this PR will regress 2 benchmarks

⚡ 4 improved benchmarks
❌ 2 regressed benchmarks
✅ 1923 untouched benchmarks
🆕 1 new benchmark
⏩ 51 skipped benchmarks¹

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	fsl_large	200.6 µs	254.3 µs	-21.14%
❌	Simulation	compress_fsst[(10000, 64, 8)]	9.6 ms	10.8 ms	-11.3%
⚡	Simulation	compact_sliced[(4096, 90)]	1.8 µs	1.6 µs	+12.16%
⚡	Simulation	decompress[u64, (1000, 16)]	73.1 µs	65.1 µs	+12.16%
⚡	Simulation	chunked_varbin_opt_to_varbinview_builder[(10, 100)]	870.4 µs	779.8 µs	+11.62%
⚡	Simulation	compact_sliced[(16384, 90)]	2 µs	1.8 µs	+11.2%
🆕	Simulation	take_varbin	N/A	1.1 ms	N/A

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

---

_{Comparing myrrc/varbin-take-zero-copy (d8d798a) with develop (c1ae775)}

Footnotes

1. 51 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩