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/services/optionSourcesService.ts

@@ -0,0 +1,27 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import * as rd from 'resource-deployment';
+import * as loc from '../localizedConstants';
+
+class OptionsSourcesService {
+	private _optionsSourceStore = new Map<string, rd.IOptionsSourceProvider>();
+	registerOptionsSourceProvider(provider: rd.IOptionsSourceProvider): void {
+		if (this._optionsSourceStore.has(provider.optionsSourceId)) {
+			throw new Error(loc.optionsSourceAlreadyDefined(provider.optionsSourceId));
+		}
+		this._optionsSourceStore.set(provider.optionsSourceId, provider);
+	}
+
+	getOptionsSource(optionsSourceProviderId: string): rd.IOptionsSourceProvider {
+		const optionsSource = this._optionsSourceStore.get(optionsSourceProviderId);
+		if (optionsSource === undefined) {
+			throw new Error(loc.noOptionsSourceDefined(optionsSourceProviderId));
+		}
+		return optionsSource;
+	}
+}
+
+export const optionsSourcesService = new OptionsSourcesService();