new module: gatk4/modelsegments

[lbeltrame]

Is there an existing module for this?

• I have searched for the existing module

Is there an open PR for this?

• I have searched for existing PRs

Is there an open issue for this?

• I have searched for existing issues

Further Information

To further progress with nf-core/sarek#1710, GATK4's segmentation needs to be added. Most of the functionality is already provided by modules, but ModelSegments (https://gatk.broadinstitute.org/hc/en-us/articles/360037225892-ModelSegments) is missing.

Are you going to work on this?

• If I'm planning to work on this module, I added myself to the Assignees to facilitate tracking who is working on the module