Quadbin Spatial Index Utilities

The `quadbin` library (version 0.4.2) provides essential utility functions for working with the Quadbin spatial index, a hierarchical geospatial indexing system developed by CARTO. Quadbins represent map cells using 64-bit integers, offering a distinct approach compared to variable-length indexing systems like Quadkey. This TypeScript-first library emphasizes performance and type safety, making it suitable for geospatial data processing in Node.js environments (requiring Node.js >=18). It's primarily used in WebGL and visualization contexts for efficient spatial queries and data aggregation. The library's main differentiator is its use of JavaScript's `BigInt` type for quadbin indices, which necessitates explicit conversion functions like `bigIntToHex` and `hexToBigInt` when serializing or deserializing data (e.g., for JSON). While specific release cadences aren't strictly defined, the package receives active maintenance, with recent dependency updates reflecting ongoing support.