Modifying the migration extension to use its own service. (#21781)

* Adding migration service to sql migrations

* enabling auto flush log

* Adding support for env variable

* Adding TDE Migration service

* code cleanup

* updating service downloader

* Removing custom output channel

* remove unnecessary await

* Updated service version to get latest code

* Consolidate TDE into migration service

* Sync to latest main

* Update sql-migration package version

* Fix merge conflict error

* Fixing all merge conflicts

* Fixing stuff

* removing extra whitespace

* Cleaning up

---------

Co-authored-by: Akshay Mata <akma@microsoft.com>

extensions/sql-migration/src/service/provider.ts

@@ -0,0 +1,46 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { ApiType, MigrationExtensionService } from './features';
+import * as constants from '../constants/strings';
+import * as vscode from 'vscode';
+
+export class MigrationServiceProvider {
+	private services: Map<ApiType, MigrationExtensionService> = new Map();
+
+	constructor() {
+	}
+
+	public addService(service: MigrationExtensionService) {
+		this.services.set(service.providerId, service);
+	}
+
+	public async getService(serviceId: ApiType): Promise<MigrationExtensionService> {
+		if (this.services.has(serviceId)) {
+			return this.services.get(serviceId)!;
+		}
+		return this.waitUntilProviderReady(serviceId);
+	}
+
+	public async waitUntilProviderReady(serviceId: ApiType): Promise<MigrationExtensionService> {
+		const service = await vscode.window.withProgress({
+			location: vscode.ProgressLocation.Notification,
+			title: constants.waitingForService(serviceId),
+			cancellable: false
+		}, (progress, token) => {
+			return new Promise<MigrationExtensionService>(resolve => {
+				const interval = setInterval(() => {
+					if (this.services.has(serviceId)) {
+						clearInterval(interval);
+						resolve(this.services.get(serviceId)!);
+					}
+				}, 250);
+			});
+		});
+		return service;
+	}
+}
+
+export const migrationServiceProvider = new MigrationServiceProvider();