alternate implementation

[jraymakers]

Merge alternate implementation into main.

Highlights of this implementation:

• Works on Darwin ARM64 (Apple Silicon), Linux x64, and Win32 x64.
• GitHub Actions workflow builds and tests bindings & API and publishes NPM packages (currently to GitHub Packages registry in this repository).
• NPM packages are split: one for the high-level API, one for the low-level bindings, and one for each supported platform to hold platform-specific binaries.
• Installation of the correct platform-specific binaries is handled automatically by NPM using optional dependencies and platform & architecture tags. No install scripts are required.
• Released DuckDB binaries are used; DuckDB is not rebuilt.
• Bindings are hand-written (not generated), but in a very mechanical style that should make detecting and incorporating upstream changes as easy as possible.
• Bindings map C parameters and return values into as-close-as-possible concepts in JS. In particular, Napi::External is used to safely and efficiently wrap objects created and returned by the C API.
• API wraps the C API and exposes a more natural object-oriented JavaScript API.
• API supports converting all DuckDB data types into easy-to-use JS objects, without loss of precision.
• API is written in TypeScript and packages including full type definitions.
• Both bindings and API have good unit test coverage.
• Not all APIs are implemented yet, but running queries (including streaming & prepared) works.