Migrate setup.cfg to pyproject.toml

[hugovk]

With help from https://github.com/abravalheri/ini2toml/ and https://github.com/abravalheri/validate-pyproject/

ini2toml setup.cfg -p setup.cfg -o pyproject.toml; validate-pyproject pyproject.toml

[codecov[bot]]

Codecov Report

Merging #97 (c4e0338) into main (5f98eff) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##              main       #97   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           78        78           
=========================================
  Hits            78        78           

Flag	Coverage Δ
macos-latest	96.15% <ø> (ø)
ubuntu-latest	96.15% <ø> (ø)
windows-latest	96.15% <ø> (ø)

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