Update pb fq2bam

[gburnett-nvidia]

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[gburnett-nvidia]

This PR includes testing for fastq merging, as well as changes to the input and output spec @blajoie

[blajoie]

Please let us know if any changes are needed to the inputs/outputs, we did implement a small refactor there with a goal of simplifying things. Would also appreciate a look at how we handled multiple input fastq pairs and keeping the RGs organized.

A separate PR for parabricks/deepvariant is coming ~tomorrow.

cc @gburnett-nvidia