rpi packages v0.1.0

Initial release of the Rust-native rpi extension packages.\n\nPrebuilt archives:\n- rpi-packages-windows-x86_64.zip\n- rpi-packages-linux-x86_64.tar.gz\n- rpi-packages-macos-x86_64.tar.gz\n- rpi-packages-macos-aarch64.tar.gz\n\nEach archive contains 16 cdylib extensions, packages.json, README.md, and the platform installer. The crates.io packages are available at their corresponding 0.1.x versions.