Granges from par_iter?

[cademirch]

Hi @vsbuffalo, thanks for the super useful crate. I'm working on a small project calculating some stats from a VCF, and am processing records in parallel using rayon::iter::par_bridge and would like to make a GRanges object from this parallel iterator.

For example:

    let records = reader
        .records()
        .par_bridge()
        .map(|result| {
            let record = result.expect("failed to read VCF record");
            // Do something with record and get data; get chrom, position
            
            Ok(GenomicRangeRecord::new(chrom.to_string(), position, position+1, data))
        });
        
// Make GRanges from records parallel iterator

I'm still fairly new to rust but would be happy to look into implementing this if you're open to it and some pointers on where to start.