Feature/atac count

[VladimirShitov]

Changelog

• Create mapping/cellranger_atac_count component to align ATAC data to reference and count peaks

Issue ticket number and link

Contributes to https://github.com/openpipelines-bio/openpipeline/issues/398

Checklist before requesting a review

• [ ] I have performed a self-review of my code

• [ ] Conforms to the Contributor's guide

• Check the correct box. Does this PR contain:

  • [ ] Breaking changes
  • [x] New functionality
  • [ ] Major changes
  • [ ] Minor changes
  • [ ] Documentation
  • [ ] Bug fixes

• [ ] Proposed changes are described in the CHANGELOG.md

• [ ] CI tests succeed!