pythonPackages.fairseq: init at 0.10.2

[rehno-lindeque]

Motivation for this change

Facebook's Sequence-to-Sequence library for pytorch.

I'm leaving this as a draft PR because it probably needs a bit more work to be useful:

• Many tests fails, for reasons
• Optional dependencies/flags should probably be investigated
• Depends on pythonPackages.sacrebleu: init at 1.5.1 #160205 and pythonPackages.expecttest: init at 0.1.3 #160197

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandbox = true set in nix.conf? (See Nix manual)
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 22.05 Release Notes (or backporting 21.11 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
  • (Release notes changes) Ran nixos/doc/manual/md-to-db.sh to update generated release notes
• Fits CONTRIBUTING.md.

[happysalada]

Thanks a lot for this draft, I've modernised it in #242398
I don't have access to a linux machine right now, so that new PR might be a while to merge. But posting this so you know your work was useful and appreciated.
Thanks again!

[rehno-lindeque]

Thank you @happysalada!