Ensure chunking is not excessive in samples dimension. #943
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For VCFs with a small number of samples, a Zarr chunk size of 1000 was being used by default which was wasteful and slow. This change limits the chunk size to the number of samples.
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From #941.
For VCFs with a small number of samples, a Zarr chunk size of 1000 was being used by default which was wasteful and slow. This change limits the chunk size to the number of samples.