deployment extension not working on Linux (#6476)

* add webpack for built in extensions

* fix the casing issue

* Rename azCLITool.ts to azCliTool.ts

* Rename kubectlTool.ts to kubeCtlTool.ts

* fix the error

* fix the packaging issue

extensions/big-data-cluster/extension.webpack.config.js

@@ -0,0 +1,19 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+//@ts-check
+
+'use strict';
+
+const withDefaults = require('../shared.webpack.config');
+
+module.exports = withDefaults({
+	context: __dirname,
+	entry: {
+		main: './src/extension.ts'
+	},
+	externals: {
+	}
+});