new subworkflow: distributed computing GRIDSS subworkflow

[johnoooh]

Is there an existing subworkflow for this?

• [X] I have searched for the existing subworkflow

Is there an open PR for this?

• [X] I have searched for existing PRs

Is there an open issue for this?

• [X] I have searched for existing issues

Are you going to work on this?

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

[johnoooh]

So there is currently a GRIDSS module in nf-core/modules but this method can be slow when running very complex tumor-normal pairs. In a HPC environment distributed computing can speed up this calling. GRIDSS has commands that allow for distributed computing but they should be broken up into different modules. Unfortunately these distributed jobs should be run in the same working directory, which is something nextflow cant really do due to the nature of the work directory. Many intermediate files are created by the individual steps and they must be passed from one process to another and then renamed to the proper names. I have done it this way and it works but I am of course open to suggestions on better ways to do this.