allow contributed range of higlight for code actions (#202197)

* groundwork for segttings

* laying groundowrk for new API

* more groundwork, api fixed

* cleanup

* more cleanup

* added updates

* fixed spacing

src/vscode-dts/vscode.proposed.codeActionRanges.d.ts

@@ -0,0 +1,17 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+declare module 'vscode' {
+
+	export interface CodeAction {
+		/**
+		 *
+		 * The range to which this Code Action applies to, which will be highlighted.
+		 *
+		 * Ex: A refactoring action will highlight the range of text that will be affected.
+		 */
+		ranges?: Range[];
+	}
+}