Feature/bbknn workflow

[mauro-saporita]

Changelog

Add BBKNN integration pipeline: run bbknn followed by leiden and run umap on the result.

Checklist before requesting a review

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

• [x] Conforms to the Contributor's guide

• Check the correct box. Does this PR contain:

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

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

• [x] CI tests succeed!

[DriesSchaumont]

Hi @mauro-saporita Is this PR ready for review?

[mauro-saporita]

@ddemaeyer sorry, there was a bit of mess in the branch. I've cleaned up everything and now it should be ready for review and merge.

[ddemaeyer]

@DriesSchaumont LGTM

[DriesSchaumont]

Great, LGTM! Thanks @mauro-saporita