feat: teach ArrayStream instrument(span)

[danking]

No description provided.

[codspeed-hq]

Merging this PR will degrade performance by 38.78%

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 2 improved benchmarks
❌ 4 regressed benchmarks
✅ 1192 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	WallTime	mix[50%_in/50%_out]	340 µs	395.3 µs	-13.99%
❌	WallTime	for[10M_u8]	75.4 µs	123.2 µs	-38.78%
❌	WallTime	for[10M_u16]	95.6 µs	151.6 µs	-36.95%
❌	WallTime	mix[100%_in/0%_out]	452.6 µs	505.9 µs	-10.53%
⚡	WallTime	runend[10M_i32_runlen_100000]	130 µs	91.1 µs	+42.7%
⚡	WallTime	10M_50%[5000000]	192.3 µs	153.4 µs	+25.35%

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_{Comparing dk/instrumented-array-stream (bc3b8f5) with develop (deb7de0)}

[a10y]

you might need the ol' ./scripts/public-api.sh