Add pyproject.toml file.

[vyasr]

This file is required for using newer PEP517-compliant projects.

[madsbk]

LGTM, thanks @vyasr

[pentschev]

rerun tests

[vyasr]

Thanks John, I wasn't quite sure what the new build_meta behavior would imply so I figured I'd try it out.

[jakirkham]

Yeah of course. Thanks for giving it a try Vyas 🙂

Think we just haven't moved enough over to pyproject.toml yet. My guess is once most things are moved over it should work. Going to give this a try after merging

[vyasr]

Improving the non-conda (and conda too of course, but that part is in a better place) packaging of RAPIDS packages is going to be something I invest a decent bit of time into in the near future as we roll out wheels (No pun intended 😄).

[jakirkham]

Yeah Python has been moving more steadily towards declarative metadata for packaging, which is a good thing all around.

To get a sense of what I mean by move more things over to pyproject.toml, PR ( #895 ) is what I'm thinking. Proposed similar changes to RMM ( rapidsai/rmm#1151 ).