Guard mappers from truncated quality strings

[adamnovak]

Changelog Entry

To be copied to the draft changelog by merger:

• vg giraffe, vg mpmap, and vg map will now fail early with an error when encountering a read with a quality string of the wrong length (as from a truncated FASTQ)

Description

This should protect users from weirder internal errors when FASTQs get truncated. It will print errors like:

error [vg::alignment.cpp]: Read m84039_230418_213342_s3/240455777/ccs has 20540 bases of sequence but only 18671 base quality values. Was the quality information truncated?