Improve visitor performance by reducing `Vec` and String allocations #6337

Performance Regression: -13.38%

⚡ 8 improved benchmarks
❌ 1 regressed benchmark
✅ 1129 untouched benchmarks
⏩ 1265 skipped benchmarks¹

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

	Mode	Benchmark	`BASE`	`HEAD`	Efficiency
⚡	Simulation	`chunked_bool_canonical_into[(1000, 10)]`	67 µs	46.6 µs	+43.67%
⚡	Simulation	`chunked_bool_into_canonical[(100, 100)]`	228.2 µs	173.5 µs	+31.55%
❌	Simulation	`chunked_bool_into_canonical[(1000, 10)]`	65.7 µs	75.9 µs	-13.38%
⚡	Simulation	`chunked_bool_into_canonical[(10, 1000)]`	1.9 ms	1.3 ms	+38.62%
⚡	Simulation	`chunked_opt_bool_into_canonical[(10, 1000)]`	2 ms	1.4 ms	+35.55%
⚡	Simulation	`chunked_opt_bool_into_canonical[(100, 100)]`	442.5 µs	386.1 µs	+14.6%
⚡	Simulation	`chunked_varbinview_into_canonical[(10, 1000)]`	3 ms	2.5 ms	+20.07%
⚡	Simulation	`patched_take_200k_dispersed`	5.6 ms	5.1 ms	+11.32%
⚡	Simulation	`decompress[u8, (1000, 16)]`	19.8 µs	17.9 µs	+10.64%

_{Comparing adamg/reduce-allocations-some-cases (9f62be2) with develop (133e7dd)}

1265 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. ↩