scGPT embedding component

[dorien-er]

Changelog

scGPT embedding for integration (zero shot or fine-tuning) component

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
  • [ ] Documentation
  • [ ] Bug fixes

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

• [x] CI tests succeed!

[rcannood]

:kissing: :notes: Nothing to see here

[dorien-er]

Ended up removing the dropout parameter in the end. Turns out we don't need it to generate embeddings, only relevant when we start fine-tuning models :-) Thx for the reviews!