[Feature Request] Add a real async run method to onnxruntime-node

[segevfiner]

Describe the feature request

There should really be a true async version of run in onnxruntime-node, running computationally intensive things on the event loop will stop everything else from happening while it is running, e.g. a web server from answering requests.

This can be done by wrapping RunAsync behind a Napi::Promise and Napi::TypedThreadSafeFunction to run on the onnxruntime thread pool, or Napi::AsyncWorker for the Node.js/libuv thread pool.

See #19610

Describe scenario use case

Don't block the event loop while running inference, which is naturally computationally intensive.

[fs-eire]

Thank you for creating this feature request!

Possible discussions:

• not sure if we need a ENV flag or session option for this. Maybe some user still prefer the sync call?
• also need for session initAsync?

[segevfiner]

Note that the current run method returns a Promise so it's not really sync to begin with just pseudo async where it defers the work to a different phase of the event loop but still blocks it.

[segevfiner]

So maybe you will want to have a new RunSync method while making the existing Run truly async.