bjmorgan / py-sc-fermi / 20881271419

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Fix global warning suppression on import (#50)

Importing py_sc_fermi previously replaced warnings.showwarning globally,
silencing all non-RuntimeWarning warnings and affecting any code that
imported the package.

Replace the global override with a decorator-based approach that converts
numpy overflow warnings to custom warning classes at the source:

- Add py_sc_fermi/warnings.py with PySCFermiWarning, DOSOverflowWarning,
  DefectOverflowWarning and catches_numpy_overflow decorator
- Apply decorator to DOS.carrier_concentrations and
  DefectChargeState.get_concentration
- Remove CustomWarningManager class and global warnings.showwarning override
- Scope warning deduplication in get_sc_fermi to PySCFermiWarning only

Custom warnings now integrate properly with Python's warning system and
can be filtered using standard mechanisms.

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