Migrate PROCESS_SEQ_REGION to nextflow_modules

[Dishalodha]

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

This module should be migrated to nextflow_modules following the guidelines in read me. Please create a suitable nf-test accordingly.

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