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Add function to get max sizes of fields from VCF
From https://github.com/pystatgen/sgkit/issues/725#issuecomment-936338657
This would retrieve the maximum number of alt alleles, ploidy, and actual (maximum) size of Number=. fields, in a form suitable for passing to the vcf_to_zarr function.
This exists as zarr_array_sizes, but it is not a part of the public API since it runs sequentially. Leaving this issue open to cover the parallel implementation.