refactor[devtools/extension]: minify production builds to strip comme…

…nts (facebook#27304)

Currently, we are unable to publish a release to Firefox extensions
store, due to `parseHookNames` chunk size, which is ~5mb.

We were not minifying production builds on purpose, to have more
descriptive error messages. Now, Terser plugin will only:
- remove comments
- mangle, but keeping function names (for understandable bug reports)

packages/react-devtools-extensions/webpack.config.js

@@ -2,6 +2,7 @@
 
 const {resolve} = require('path');
 const Webpack = require('webpack');
+const TerserPlugin = require('terser-webpack-plugin');
 const {
   DARK_MODE_DIMMED_WARNING_COLOR,
   DARK_MODE_DIMMED_ERROR_COLOR,
@@ -84,7 +85,21 @@ module.exports = {
     },
   },
   optimization: {
-    minimize: false,
+    minimize: !__DEV__,
+    minimizer: [
+      new TerserPlugin({
+        terserOptions: {
+          compress: false,
+          mangle: {
+            keep_fnames: true,
+          },
+          format: {
+            comments: false,
+          },
+        },
+        extractComments: false,
+      }),
+    ],
   },
   plugins: [
     new Webpack.ProvidePlugin({