fix: TableStrategy currently hides panic in spawned column writer tasks.

[AdamGS]

Rationale for this change

TableStrategy currently hides panics that happen in the individual column streams.

What changes are included in this PR?

Instead of detaching the fanout work, we await it and make sure everything finishes successfully.

What APIs are changed? Are there any user-facing changes?

No API change, added test to verify panic propagation.

[codspeed-hq]

Merging this PR will not alter performance

⚡ 4 improved benchmarks
❌ 1 regressed benchmark
✅ 1602 untouched benchmarks
⏩ 42 skipped benchmarks¹

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	chunked_varbinview_into_canonical[(1000, 10)]	170.1 µs	206.4 µs	-17.56%
⚡	Simulation	chunked_varbinview_canonical_into[(1000, 10)]	190.5 µs	154 µs	+23.7%
⚡	Simulation	rebuild_naive	105.5 µs	91.4 µs	+15.49%
⚡	Simulation	chunked_varbinview_into_canonical[(100, 100)]	307.7 µs	272.5 µs	+12.94%
⚡	Simulation	bitwise_not_vortex_buffer_mut[128]	273.6 ns	244.4 ns	+11.93%

Tip

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

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_{Comparing adamg/fix-panic-propegation-async-spawn (9824901) with develop (0d50342)}

Footnotes

1. 42 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. ↩