Node.js string_decoder for Userland

The `string_decoder-okam` package provides a userland mirror of the `string_decoder` module from Node.js core, enabling its use in environments where the native module might not be available or needs polyfilling, such as in browsers via Browserify, or in older Node.js versions. The current stable version is 1.3.0, with releases historically tied to specific Node.js core updates (e.g., v1.1.0 updated to match Node 8.9.4) and dependency bumps. Since version 1.0.0, the package adheres to semantic versioning. It is maintained by the Node.js Streams Working Group, ensuring its alignment with Node.js stream standards. Its key differentiator is providing the exact Node.js core implementation for consistent behavior across different JavaScript environments, making it suitable for cross-environment compatibility.