Generate scgpt cross check genes module

[jakubmajercik]

Changelog

Cross check genes component added

Issue ticket number and link

Closes #747

Checklist before requesting a review

• [x] 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

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

• [x] CI tests succeed!

[dorien-er]

Thanks a lot Jakub 🙏 👍 From my side things looks good when these adjustment to use a subsampled test dataset are made

[DriesSchaumont]

Could you also merge the scgpt branch into 747-generate-scgpt-cross_check_genes-module?