chore: benchmark with execution context input

[joseph-isaacs]

Create execution context outside of benchmark hot loop

[codspeed-hq]

Merging this PR will improve performance by ×2.2

⚡ 4 improved benchmarks
✅ 1119 untouched benchmarks
⏩ 1455 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Simulation	chunked_constant_utf8_append_to_builder[("hi", 1000, 10)]	143.3 µs	105.5 µs	+35.8%
⚡	Simulation	chunked_dict_primitive_into_canonical[u32, (1000, 10, 10)]	151 µs	120.5 µs	+25.28%
⚡	Simulation	case_when_fragmented[100]	152.8 µs	121.9 µs	+25.43%
⚡	Simulation	fsst_contains[urls]	10.5 ms	4.8 ms	×2.2

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_{Comparing ji/exe-ctx-thread (e35cfd1) with develop (1a56560)}

Footnotes

1. 1455 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. ↩