move build configuration into pyproject.toml

[zacharyburnett]

setuptools now supports the [project] table, which is defined by PEP621.

Additionally, setuptools now supports its own entry in pyproject.toml called [tool.setuptools] (pypa/setuptools#1688, https://setuptools.pypa.io/en/latest/userguide/pyproject_config.html#setuptools-specific-configuration); however, it comes with the following disclaimer:

Support for declaring configurations not standardized by PEP 621 (i.e. the [tool.setuptools] table), is still in beta stage and might change in future releases.

Given this, we can attempt to consolidate the build configuration into a single pyproject.toml file that can possibly be read by other build systems in the future.

[codecov]

Codecov Report

Base: 70.45% // Head: 70.45% // No change to project coverage 👍

Coverage data is based on head (e940da5) compared to base (33aa4f4).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #95   +/-   ##
=======================================
  Coverage   70.45%   70.45%           
=======================================
  Files          15       15           
  Lines        2623     2623           
=======================================
  Hits         1848     1848           
  Misses        775      775           

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.

[zacharyburnett]

Now that Python 3.11 includes tomli in built-ins, and given that stcal doesn't build C extensions, I am comfortable with readying this for review. flake8 requires its own file, but if we ever move to a different linter in the future (e.g. ruff) we will likely be able to use pyproject.toml for its configuration

[zacharyburnett]

If setuptools changes their interface with pyproject.toml it would involve updating the [tool.setuptools] table, i.e. changing the following values:

 [tool.setuptools]
 zip-safe = true

 [tool.setuptools.packages.find]
 where = ['src']

The [project] table would remain unchanged as it is defined by PEP621.

[nden]

LGTM