Add Node.js C++ bindings

[junhaoliao]

Request

Add native Node.js C++ bindings to enable more efficient VSCode extension development.

Possible implementation

1. Add N-API bindings: Create native addon using node-addon-api that wraps existing clp-ffi-js classes (StreamReader, etc.)
2. Build system: Add CMake target for native addon alongside existing Emscripten build
   Prebuilds: Use prebuildify for common platforms (Windows, macOS, Linux x64/ARM64)
3. Dual package exports:

   {
     "exports": {
       "./node": "./dist/native/clp-ffi-native.node",
       "./worker": "./dist/ClpFfiJs-worker.js"
     }
   }

This maintains the existing WebAssembly build while adding native Node.js support specifically for VSCode extension use cases.