fix(@angular-devkit/build-angular): support pnpm with ng serve

Webpack and its development server assume the presence of two node builtins (`events` & `querystring`).  Do to package hoisting npm/yarn will usually place the shims for those two builtins at locations that webpack find them.  This is however not guaranteed nor will it work with pnpm which strictly follows the prescribed dependency tree.
To remedy this, the specific node shims are enabled only for the specific internal webpack files that are used within the development server.  This ensures that the requirements of these files does not pollute the entire application.

Fixes #13680

Author: clydin

packages/angular_devkit/build_angular/src/angular-cli-files/models/webpack-configs/browser.ts

@@ -107,6 +107,6 @@ export function getBrowserConfig(wco: WebpackConfigOptions): webpack.Configurati
       },
     } as webpack.Options.Optimization,
     plugins: extraPlugins,
-    node: false,
+    node: { },
   };
 }

packages/angular_devkit/build_angular/src/angular-cli-files/models/webpack-configs/common.ts

@@ -402,6 +402,14 @@ export function getCommonConfig(wco: WebpackConfigOptions): Configuration {
           test: /[\/\\]@angular[\/\\]core[\/\\].+\.js$/,
           parser: { system: true },
         },
+        {
+          test: /[\/\\]hot[\/\\]emitter.js$/,
+          parser: { node: { events: true } },
+        },
+        {
+          test: /[\/\\]webpack-dev-server[\/\\]client[\/\\]utils[\/\\]createSocketUrl.js$/,
+          parser: { node: { querystring: true } },
+        },
         {
           test: /\.js$/,
           ...buildOptimizerUseRule,