fix(inspector_modules): Switch to single runtime chunk

The default setting causes the WebPack runtime to be loaded twice
because the `inspector_modules` module is loaded by the iOS runtime
as a secondary entry point. This has some undesirable implications
as [stated in the documentation](https://webpack.js.org/configuration/optimization/#optimizationruntimechunk):

> Imported modules are initialized for each runtime chunk separately,
> so if you include multiple entry points on a page, beware of this
> behavior. You will probably want to set it to single or use another
> configuration that allows you to only have one runtime instance.

Author: mbektchiev

Diff for: templates/webpack.angular.js

@@ -140,6 +140,7 @@ module.exports = env => {
         },
         devtool: sourceMap ? "inline-source-map" : "none",
         optimization: {
+            runtimeChunk: "single",
             splitChunks: {
                 cacheGroups: {
                     vendor: {
@@ -257,10 +258,16 @@ module.exports = env => {
                 { from: { glob: "**/*.png" } },
             ], { ignore: [`${relative(appPath, appResourcesFullPath)}/**`] }),
             // Generate a bundle starter script and activate it in package.json
-            new nsWebpack.GenerateBundleStarterPlugin([
-                "./vendor",
-                "./bundle",
-            ]),
+            new nsWebpack.GenerateBundleStarterPlugin(
+                // Don't include `runtime.js` when creating a snapshot. The plugin
+                // configures the WebPack runtime to be generated inside the snapshot
+                // module and no `runtime.js` module exist.
+                (snapshot ? [] : ["./runtime"])
+                .concat([
+                    "./vendor",
+                    "./bundle",
+              ])
+            ),
             // For instructions on how to set up workers with webpack
             // check out https://github.com/nativescript/worker-loader
             new NativeScriptWorkerPlugin(),

Diff for: templates/webpack.javascript.js

@@ -100,7 +100,8 @@ module.exports = env => {
             "__dirname": false,
         },
         devtool: sourceMap ? "inline-source-map" : "none",
-        optimization:  {
+        optimization: {
+            runtimeChunk: "single",
             splitChunks: {
                 cacheGroups: {
                     vendor: {
@@ -209,10 +210,16 @@ module.exports = env => {
                 { from: { glob: "**/*.png" } },
             ], { ignore: [`${relative(appPath, appResourcesFullPath)}/**`] }),
             // Generate a bundle starter script and activate it in package.json
-            new nsWebpack.GenerateBundleStarterPlugin([
-                "./vendor",
-                "./bundle",
-            ]),
+            new nsWebpack.GenerateBundleStarterPlugin(
+                // Don't include `runtime.js` when creating a snapshot. The plugin
+                // configures the WebPack runtime to be generated inside the snapshot
+                // module and no `runtime.js` module exist.
+                (snapshot ? [] : ["./runtime"])
+                .concat([
+                    "./vendor",
+                    "./bundle",
+              ])
+            ),
             // For instructions on how to set up workers with webpack
             // check out https://github.com/nativescript/worker-loader
             new NativeScriptWorkerPlugin(),

Diff for: templates/webpack.typescript.js

@@ -102,7 +102,8 @@ module.exports = env => {
             "__dirname": false,
         },
         devtool: sourceMap ? "inline-source-map" : "none",
-        optimization:  {
+        optimization: {
+            runtimeChunk: "single",
             splitChunks: {
                 cacheGroups: {
                     vendor: {
@@ -222,10 +223,16 @@ module.exports = env => {
                 { from: { glob: "**/*.png" } },
             ], { ignore: [`${relative(appPath, appResourcesFullPath)}/**`] }),
             // Generate a bundle starter script and activate it in package.json
-            new nsWebpack.GenerateBundleStarterPlugin([
-                "./vendor",
-                "./bundle",
-            ]),
+            new nsWebpack.GenerateBundleStarterPlugin(
+                // Don't include `runtime.js` when creating a snapshot. The plugin
+                // configures the WebPack runtime to be generated inside the snapshot
+                // module and no `runtime.js` module exist.
+                (snapshot ? [] : ["./runtime"])
+                .concat([
+                    "./vendor",
+                    "./bundle",
+              ])
+            ),
             // For instructions on how to set up workers with webpack
             // check out https://github.com/nativescript/worker-loader
             new NativeScriptWorkerPlugin(),

Diff for: templates/webpack.vue.js

@@ -113,6 +113,7 @@ module.exports = env => {
         },
         devtool: "none",
         optimization: {
+            runtimeChunk: "single",
             splitChunks: {
                 cacheGroups: {
                     vendor: {
@@ -229,10 +230,16 @@ module.exports = env => {
                 { from: { glob: "assets/**/*" } },
             ], { ignore: [`${relative(appPath, appResourcesFullPath)}/**`] }),
             // Generate a bundle starter script and activate it in package.json
-            new nsWebpack.GenerateBundleStarterPlugin([
-                "./vendor",
-                "./bundle",
-            ]),
+            new nsWebpack.GenerateBundleStarterPlugin(
+                // Don't include `runtime.js` when creating a snapshot. The plugin
+                // configures the WebPack runtime to be generated inside the snapshot
+                // module and no `runtime.js` module exist.
+                (snapshot ? [] : ["./runtime"])
+                .concat([
+                    "./vendor",
+                    "./bundle",
+              ])
+            ),
             // For instructions on how to set up workers with webpack
             // check out https://github.com/nativescript/worker-loader
             new NativeScriptWorkerPlugin(),