gatk4/markduplicates - pipe uncompressed output to speed up CRAM writing

[pontushojer]

WIP! This is my first PR to nf-core/modules. I have not gotten this to work locally yet but figured I would share anyway.

I was running nf-core/sarek which uses this module for duplicate marking. When using CRAM output this module currently writes a BAM and then converts it to CRAM. This is quite wasteful, on one of my samples the MarkDuplicates finished after 153 minutes while the module duration was 224 minutes, that's an additional 71 minutes for CRAM output.

In this PR the output is instead piped as uncompressed BAM to �samtools which writes output to the desired format. I have not done any benchmarks yet but judging from this article it should be comparable to just running MarkDuplicates.

PR checklist

Closes #XXX

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