allow registering options source providers to resource-deployment (#12712)

* first draft

* compile fixes

* uncomment code

* waitForAzdataToolDisovery added to azdata api

* missed change in last commit

* remove switchReturn

* contributeOptionsSource renamed

* remove switchReturn reference

* create optionSourceService

* azdataTool usage more reliable

* package.json fixes and cleanup

* cleanup

* revert 4831a6e6b8b08684488b2c9e18092fa252e3057f

* pr feedback

* pr feedback

* pr feedback

* cleanup

* cleanup

* fix eulaAccepted check

* fix whitespade in doc comments.

extensions/resource-deployment/src/typings/resource-deployment.d.ts

@@ -0,0 +1,28 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+declare module 'resource-deployment' {
+	import * as azdata from 'azdata';
+
+	export const enum extension {
+		name = 'Microsoft.resource-deployment'
+	}
+	export interface IOptionsSourceProvider {
+		readonly optionsSourceId: string,
+		getOptions(): Promise<string[] | azdata.CategoryValue[]> | string[] | azdata.CategoryValue[];
+		getVariableValue?: (variableName: string, input: string) => Promise<string> | string;
+		getIsPassword?: (variableName: string) => boolean | Promise<boolean>;
+	}
+
+	/**
+	 * Covers defining what the resource-deployment extension exports to other extensions
+	 *
+	 * IMPORTANT: THIS IS NOT A HARD DEFINITION unlike vscode; therefore no enums or classes should be defined here
+	 * (const enums get evaluated when typescript -> javascript so those are fine)
+	 */
+
+	export interface IExtension {
+		registerOptionsSourceProvider(provider: IOptionsSourceProvider): void
+	}
+}