[Feature Request] Enable local builds of onnxruntime-node with OpenVINO EP

### Describe the feature request

* onnxruntime-node ships with a small set of supported EPs as mentioned in the documentation https://github.com/microsoft/onnxruntime/tree/main/js/node. However, the code allows local builds of the onnxruntime-node package of EPs not mentioned in that table, e.g. QNN. This can be achieved through additional flags to the build script such as `use_qnn`.
* Right now, OpenVINO EP is not supported at all, not even for local builds. I am in the situation to require such a local build. I already implemented the small additional changes for this myself. I feel this can be merged and by default the new flag can be set to OFF, similar to various other EPs in the onnxruntime-node build

### Describe scenario use case

You want to locally build onnxruntime-node with OpenVINO EP support

No file or test is named. Start by locating the onnxruntime-node build script and comparing its existing use_qnn and other execution-provider flags; verify the result with a local onnxruntime-node build where OpenVINO support is selectable and disabled by default.

Written by the indexing model from the issue text.