move build configuration into pyproject.toml

[zacharyburnett]

similar to spacetelescope/romancal#512

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.

This functionality with setuptools will likely be supported upon the release of Python 3.11, with its native implementation of tomli

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.

[WilliamJamieson]

Needs a slight modification to work with pyproject.toml configured projects, isolated_build = True needs to be added see: https://github.com/asdf-format/asdf/blob/3e6679f310cdaabddb55761880c952d0a5199b35/tox.ini#L1-L3.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.73%. Comparing base (5c9c58f) to head (940354c).
Report is 236 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #100      +/-   ##
==========================================
- Coverage   76.78%   76.73%   -0.05%     
==========================================
  Files          15       15              
  Lines        2076     2076              
==========================================
- Hits         1594     1593       -1     
- Misses        482      483       +1     

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[nden]

Note #108

[WilliamJamieson]

LGTM