Contact maps - Githubissues

Added the contact maps subworkflow and associated configuration changes.

PR checklist

[x ] This comment contains a description of changes (with reason).
[x ] If you've fixed a bug or added code that should be tested, add tests!
- [x ] If you've added a new tool - have you followed the pipeline conventions in the contribution docs
- [ ] If necessary, also make a PR on the nf-core/genomenote branch on the nf-core/test-datasets repository.
[x ] Make sure your code lints (nf-core lint).
[ x] Ensure the test suite passes (nextflow run . -profile test,docker --outdir <OUTDIR>).
[ ] Usage Documentation in docs/usage.md is updated.
[ ] Output Documentation in docs/output.md is updated.
[ ] CHANGELOG.md is updated.
[ ] README.md is updated (including new tool citations and authors/contributors).