migrate to pyproject.toml for packaging

[SauravMaheshkar]

pyproject.toml is the new standard for packaging python packages, setup.py is now deprecated (first introduced in PEP 518 and later expanded in PEP 517, PEP 621 and PEP 660).

Shifting to a pyproject.toml based build would lead to a much simpler project structure (a single pyproject.toml as opposed to setup.py + pyproject.toml + requirements-dev.txt).

Nothing much would change for the end user, the way to install the package still remains the same. The only minimal change would be to use python -m build.

I'm happy to take this up 😄

References:

• A similar PR was accepted to pytorch-geometric which now only relies on a pyproject.toml based build system. feat: migrate to pyproject.toml for building package pyg-team/pytorch_geometric#6880

[mariogeiger]

Hi,
I would be very happy. I already have an attempt of that so feel free to suggest modifications.