[WIP] allow using 'webgpu' in nodejs binding

[fs-eire]

This change allows using WebGPU in transformer.js with ORT Node.js binding.

Still doing testing (while the tests need this change)

[AdamStrojek]

Wouldn't it be better to do the same thing as it is done in Onnx Runtime Web?

    if (apis.IS_WEBGPU_AVAILABLE) {
        supportedDevices.push('webgpu');
    }

Electron applications can have WebGPU enabled when terminal Node not. Also onnx-runtime-node provides only backers for native modules, when onnx-runtime-web have bindings for WebGPU, so just adding supported devices will not work without switching runtime

[fs-eire]

If I remember it correctly, IS_WEBGPU_AVAILABLE is checked against nagivator.gpu, which is only available in browser.

For electron, the rendering process is actually a "web" environment instead of "node"

[AdamStrojek]

Yes, you are correct, IS_WEBGPU_AVAILABLE is just a simple check against navigation.gpu. In theory, it is possible to install a 3rd-party package for WebGPU support in Node, but it is a complicated topic. Still, my comment is valid; I copied my example from a few lines higher in the same source file.

I recently did tests. Unfortunately, transformers.js are not detecting Electron applications correctly and mark them as Node applications, so it provides only CPU. I had a lot of trouble getting it running in an Electron app. Mostly, it was picky about path and fs packages. If I changed the target platform to Node, it generated other problems. I'm preparing a new issue report for developers with my findings.

I already did tests with your branch, and this simple change didn’t enable WebGPU in Electron apps.