feat(python): workflow to build python package

[danielebriggi]

No description provided.

[Copilot]

Pull Request Overview

This PR introduces a complete Python package building and publishing workflow for the SQLite Vector extension, enabling distribution of prebuilt binaries through PyPI.

• Adds Python package configuration with setup.py, pyproject.toml, and requirements for building platform-specific wheels
• Implements automated artifact downloading from GitHub releases for multiple platforms (Linux, Windows, macOS) and architectures
• Creates GitHub Actions workflow for building and publishing Python packages to PyPI with trusted publishing

Reviewed Changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
packages/python/setup.py	Python package setup script with environment-based versioning and platform-specific wheel building
packages/python/pyproject.toml	Project metadata and build system configuration for the sqlite-vector package
packages/python/download_artifacts.py	Script to download and extract platform-specific binaries from GitHub releases
packages/python/README.md	Documentation for the Python package installation and usage
packages/python/requirements-dev.txt	Development dependencies for building the package
packages/python/MANIFEST.in	Package manifest to include binaries and documentation files
.github/workflows/python-package.yml	GitHub Actions workflow for automated building and publishing to PyPI
README.md	Updated main README with Python package installation instructions

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