New samtools/bgzip module to produce BGZF-compressed files.

[charles-plessy]

I propose a new module, samtools/bgzip, to produce BGZF-compressed files (usually genomes in FASTA format).

This module can take a FASTA file regardless if it is gzipped or not.

• If the file was not compressed, it is compressed with bgzip.
• If the file was compressed with gzip, it uncompressed and recompressed with bgzip.
• If the file was already compressed with bgzip, the module returns it unchanged.

This solved the issue that some pipelines request input data to be already bgzipped, but data providers like NCBI do not use bgzip for compressing their files (in particular genomes).

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[Joon-Klaps]

Lgtm!

[charles-plessy]

Thanks Joon for the review! Following new discussions on #7444, I will wait before adding a couple of fixes, maybe rename the module, and then ask again for review!