Whatshap/phase: add pedigree input

[tetedange13]

whatshap/phase can use a pedigree file to improve phasing

Relevant documentation : https://whatshap.readthedocs.io/en/latest/guide.html#phasing-pedigrees

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[famosab]

How does the pedigree file not change anything in the output ❓
But i think this is good to go :)

[tetedange13]

How does the pedigree file not change anything in the output

I think (could not assert that from the code) that whatshap ignores pedigree when only 1 sample involved (which is the case in these tests)

I observed consistent behaviour locally with bigger dataset (100K variants)

[famosab]

Can you then add a test with multiple samples where the pedigree is not ignored? :)

[tetedange13]

@famosab I can add such test, but after inspection I do not have all required data on nf-core/test-datatasets

Will have to add them first -> move current PR status to "draft"