Pymemesuite

Added
- `Matrix` constructor from an iterable of rows.
- Wheels for CPython 3.12 and PyPy 3.10.

Changed
- Bumped Cython dependency to `v3.0`.

Added
- `pymemesuite.common.Background` to store the background model frequencies.

Changed
- `FIMO.score_motif` and `Motif.build_pssm` now expect `Background` objects instead of raw `Array` objects with the background model frequencies.

Initial alpha release (test deployment to PyPI).