Always try compressing extension array's storage directly

[AdamGS]

Summary

The existing logic will always take the first smaller extension-specific scheme, even if directly compressing the storage array is even smaller.

[codspeed-hq]

Merging this PR will improve performance by 19.85%

⚠️ Unknown Walltime execution environment detected

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

⚡ 1 improved benchmark
✅ 1265 untouched benchmarks

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Simulation	chunked_varbinview_opt_canonical_into[(1000, 10)]	225.4 µs	188.1 µs	+19.85%

Tip

Curious why this is faster? Comment @codspeedbot explain why this is faster on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing adamg/ext-compression-fix (5357070) with develop (084f327)}