Do not try integer packing for huge values

[padix-key]

Currently, pdbx.compress() will always try integer packing on an integer array. However, this may explode, if the input array has large input values, as the number of bytes per element is (value // 256) + 1 (for byte_count=1 and is_unsigned=True).
This PR fixes this by estimating the integer packing output size before trying it.

[codspeed-hq]

CodSpeed Performance Report

Merging #683 will degrade performances by 10.55%

_{Comparing padix-key:compress (1edfc0c) with main (53256ed)}

Summary

❌ 1 (👁 1) regressions
✅ 44 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	padix-key:compress	Change
👁	benchmark_compress	506 ms	565.6 ms	-10.55%