Migration wizard Refresh 11th Feb 2021 (#14257)

* Adding summary page,
Storing ongoing migrations,
localizing some string,
made changes to how dropdowns work
updated database backup page

* Moved classes into different files
Fixed a lot of typos
Fixed some UI margins

extensions/sql-migration/src/models/migrationLocalStorage.ts

@@ -0,0 +1,65 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+import * as vscode from 'vscode';
+import { azureResource } from 'azureResource';
+import { DatabaseMigration, SqlManagedInstance } from '../api/azure';
+import * as azdata from 'azdata';
+
+
+export class MigrationLocalStorage {
+	private static context: vscode.ExtensionContext;
+	private static mementoToken: string = 'sqlmigration.databaseMigrations';
+
+	public static setExtensionContext(context: vscode.ExtensionContext): void {
+		MigrationLocalStorage.context = context;
+	}
+
+	public static getMigrations(connectionProfile: azdata.connection.ConnectionProfile): MigrationContext[] {
+
+		let dataBaseMigrations: MigrationContext[] = [];
+		try {
+			const migrationMementos: MigrationContext[] = this.context.globalState.get(this.mementoToken) || [];
+
+			dataBaseMigrations = migrationMementos.filter((memento) => {
+				return memento.connection.serverName === connectionProfile.serverName;
+			}).map((memento) => {
+				return memento;
+			});
+		} catch (e) {
+			console.log(e);
+		}
+
+
+		return dataBaseMigrations;
+	}
+
+	public static saveMigration(connection: azdata.connection.ConnectionProfile, migration: DatabaseMigration, targetMI: SqlManagedInstance, azureAccount: azdata.Account, subscription: azureResource.AzureResourceSubscription): void {
+		try {
+			const migrationMementos: MigrationContext[] = this.context.globalState.get(this.mementoToken) || [];
+			migrationMementos.push({
+				connection: connection,
+				migration: migration,
+				targetMI: targetMI,
+				subscription: subscription,
+				azureAccount: azureAccount
+			});
+			this.context.globalState.update(this.mementoToken, migrationMementos);
+		} catch (e) {
+			console.log(e);
+		}
+	}
+
+	public static clearMigrations() {
+		this.context.globalState.update(this.mementoToken, ([] as MigrationContext[]));
+	}
+}
+
+export interface MigrationContext {
+	connection: azdata.connection.ConnectionProfile,
+	migration: DatabaseMigration,
+	targetMI: SqlManagedInstance,
+	azureAccount: azdata.Account,
+	subscription: azureResource.AzureResourceSubscription
+}