Switch setup configuration to to pyproject.toml

[altheaden]

In this PR I've migrated the setup configuration from the older setup.py and setup.cfg procedure to a pyproject.toml approach. There is an additional configuration file for flake8 because flake8 doesn't support the pyproject.toml format.

Checklist

• Testing comment in the PR documents testing used to verify the changes

[altheaden]

Testing

I ran the configure script with this command:

./configure_polaris_envs.py --conda ~/miniforge3/ --env_name polaris-test --verbose --recreate

and it worked as expected. Then, I loaded the environment via the load script and received this error:

Loading conda environment
Done.

Loading Spack environment...

Lmod is automatically replacing "gcc-native/12.3" with "gcc/12.2.0".


The following have been reloaded with a version change:
  1) gcc/12.2.0 => gcc/11.2.0


The following have been reloaded with a version change:
  1) craype/2.7.30 => craype/2.7.20

Lmod has detected the following error:  The following module(s) are unknown:
"libfabric/1.15.2.0"

Please check the spelling or version number. Also try "module spider ..."
It is also possible your cache file is out-of-date; it may help to try:
  $ module --ignore_cache load "libfabric/1.15.2.0"

Also make sure that all modulefiles written in TCL start with the string #%Module



Done.

I'm not sure if the error is due to this update, though, because I get the same error when I run the configure script and source the load script on main.

[xylar]

No, unrelated to this and something we'll fix in the 0.5.0 version update.

[xylar]

This looks great, @altheaden! I was able to run the configure script on Chrysalis, recreate my conda environment, and run polaris list.