[gagnonanthony]

To improve segmentation in younger subjects (<3 months), we switch the MCRIB-S solution to a combination of bibsnet and infant freesurfer. This enables the surfaces to be registered to the usual fsaverage and facilitates mapping from fslr32k to subject space, similar to what is currently done for older subjects. This PR introduces the two new modules and heavy modifications to the segmentation subworkflow.

Linked to doc update here: scilus/sf-pediatric-documentation#16

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[gagnonanthony]

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