Add CUDA 12.0 migrator.

[bdice]

Checklist

• Used a personal fork of the feedstock to propose changes
• Bumped the build number (if the version is unchanged)
• Reset the build number to 0 (if the version changed)
• Re-rendered with the latest conda-smithy (Use the phrase @conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• Ensured the license file is being packaged.

This PR adds a migrator for CUDA 12 support. The compiler package name is changing from nvcc to cuda-nvcc, so cuda_compiler must be added to zip_keys. CUDA 12 builds should use gcc/g++ version 12, and they do not need a special CUDA Docker image (the normal Docker image is sufficient).

This is my first time submitting a migrator, so please forgive any egregious mistakes! I'm starting this as a draft and getting some input before opening for review. cc: @jakirkham @leofang @adibbley @vyasr

[conda-forge-webservices]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe) and found it was in an excellent condition.

[jakirkham]

Thanks Bradley! 🙏

Added a few suggestions below 🙂

[jakirkham]

Went ahead and submitted PR ( #4407 ) to add cuda_compiler to zip_keys. Think we should be able to simplify this with that change

Edit: That PR has now been merged. Have updated the branch here to include those changes

[jakirkham]

Included a few suggestions below to simplify things (now that some changes have been moved to conda_build_config.yaml)

[jakirkham]

Added use_local lines to simplify testing. Flagging them as a reminder to remove them

Resolved

[jakirkham]

Just a note, retested the latest changes here on NCCL, UCX & CuPy. They behaved as expected (equivalent to the current CUDA 12 state for each of those)

[jakirkham]

Sounds like we are ok with starting this based on discussion in the core meeting. Going to go ahead and merge. Happy to follow up on anything as needed. Thanks all! 🙏