chore: import upstream snapshot with attribution

doc/js_tutorials/js_assets/webnn-electron/node_setup.js

@@ -0,0 +1,12 @@
+const cv = require('./opencv');
+const webnn = require(process.env.WEBNN_NATIVE_DIR+'/../../node/lib/webnn');
+// navigator is undefined in node.js, but defined in electron.js.
+if (global.navigator === undefined) {
+  global.navigator = {};
+}
+global.navigator.ml = webnn.ml;
+global.MLContext = webnn.MLContext
+global.MLGraphBuilder = webnn.MLGraphBuilder
+global.MLGraph = webnn.MLGraph
+global.MLOperand = webnn.MLOperand
+global.cv = cv;