Merge setup.cfg into pyproject.toml

[redeboer]

ComPWA/polarimetry#309 has shown that a pyproject.toml with pinned constraint files works quite well. As a follow-up to #98, we could consider merging all setup.cfg files into pyproject.toml as well to further reduce the number of configuration files. As shown in ComPWA/polarimetry#309, optional dependencies can be defined by repeating the package name instead of using the %(dev)s syntax, e.g. polarimetry[dev].

One disadvantage: editable installs with pyproject.toml are only supported since pip v23.1 (2021-10-11), see PEP 660. Another is that Python 3.6 requires setup.cfg.

Related issues

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1. MAINT!: merge setup.cfg into pyproject.toml polarimetry#309
   🔨 Maintenance +1
   
2. https://github.com/ComPWA/Nstar-documentation/issues/2
3. Use TOML syntax for tox configuration #180
   3 of 4
   ✨ Feature 🖱️ DX +2
   

Implementation

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1. BEHAVIOR: mege setup.cfg into pyproject.toml repo-maintenance#184
   ✨ Feature ❗ Behavior +2
   
2. MAINT: autoupdate pre-commit hooks actions#32
   🔨 Maintenance +1
   
3. MAINT: update pip constraints and pre-commit ampform#358
   🔨 Maintenance +1
   
4. MAINT: update pip constraints and pre-commit ampform-dpd#79
   🔨 Maintenance +1
   
5. MAINT: autoupdate pre-commit hooks benchmarks#18
   🔨 Maintenance +1
   
6. MAINT: update pip constraints and pre-commit compwa-org#211
   🔨 Maintenance +1
   
7. https://github.com/ComPWA/PWA-JPsi2pbarSigmaKS/pull/68
8. MAINT: update pip constraints and pre-commit PWA-pages#195
   🔨 Maintenance +1
   
9. MAINT: update pip constraints and pre-commit tensorwaves#498
   🔨 Maintenance +1