Reduce packaged size of extensions (#4300)

* reduce output of notebooks

* reduce size of azurecore

* update mssql extensions to be webpacked

* formatting

* remove commented code

* fix packaged config

* fix mssql packing

extensions/azurecore/extension.webpack.config.js

@@ -0,0 +1,21 @@
+/*---------------------------------------------------------------------------------------------
+ *  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: {
+		extension: './src/extension.ts'
+	},
+	externals: {
+		'ms-rest': 'commonjs ms-rest',
+		'request': 'commonjs request'
+	}
+});