Fix some webpack warnings

Author: gjsjohnmurray

webpack.config.js

@@ -15,6 +15,10 @@ const config = {
   devtool: "source-map",
   externals: {
     vscode: "commonjs vscode", // the vscode-module is created on-the-fly and must be excluded. Add other modules that cannot be webpack'ed, 📖 -> https://webpack.js.org/configuration/externals/
+    "@opentelemetry/tracing": "commonjs @opentelemetry/tracing",
+    "applicationinsights-native-metrics": "commonjs applicationinsights-native-metrics",
+    bufferutil: "commonjs bufferutil",
+    "utf-8-validate": "commonjs utf-8-validate",
   },
   resolve: {
     // support reading TypeScript and JavaScript files, 📖 -> https://github.com/TypeStrong/ts-loader