new module: stimulus/splitcsv

[yocra3]

Is there an existing module for this?

• [x] I have searched for the existing module

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

Further Information

No response

Are you going to work on this?

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

[yocra3]

Things to check:

• Documentation
• Testing on singularity and conda