feat: aligners & variant callers

[adthrasher]

Adds new WDL task implementations:

• bwa-mem2
• minimap2
• hisat2
• vg giraffe
• DeepVariant / DeepSomatic
• Strelka
• Manta
• Clair3
• NGSEP

I also created a new evaluation directory under workflows (maybe it should be placed somewhere else) that has workflows for running a sample through multiple analyses in parallel for comparison purposes.

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[adthrasher]

Lint failures are for EmptyOutputs, which is addressed in #315