Prebuilt libnode binaries

Installation

Downloads are in the releases

mkdir -p /opt/libnode
curl -L --url https://github.com/alshdavid/libnode-prebuilt/releases/download/v22.15.0/libnode-linux-amd64.tar.xz \
  | tar -xJvf - -C /opt/libnode

Patches for C FFI

This includes this PR which adds an extern C function node_embedding_main for embedders coming from languages that cannot use C++ bindings (Like Rust, C#, etc).