Initial Code Layering (#3788)

* working on formatting

* fixed basic lint errors; starting moving things to their appropriate location

* formatting

* update tslint to match the version of vscode we have

* remove unused code

* work in progress fixing layering

* formatting

* moved connection management service to platform

* formatting

* add missing file

* moving more servies

* formatting

* moving more services

* formatting

* wip

* moving more services

* formatting

* revert back tslint rules

* move css file

* add missing svgs

src/sql/platform/connection/common/constants.ts

@@ -0,0 +1,37 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+// constants
+export const sqlConfigSectionName = 'sql';
+export const outputChannelName = 'MSSQL';
+
+export const connectionsArrayName = 'datasource.connections';
+export const connectionGroupsArrayName = 'datasource.connectionGroups';
+
+/**Unsaved connections Id */
+export const unsavedGroupId = 'unsaved';
+
+/* Memento constants */
+export const activeConnections = 'ACTIVE_CONNECTIONS';
+export const recentConnections = 'RECENT_CONNECTIONS';
+export const capabilitiesOptions = 'OPTIONS_METADATA';
+
+export const configMaxRecentConnections = 'maxRecentConnections';
+
+export const mssqlProviderName = 'MSSQL';
+export const anyProviderName = '*';
+export const connectionProviderContextKey = 'connectionProvider';
+
+export const applicationName = 'sqlops';
+
+export const defaultEngine = 'defaultEngine';
+
+export const passwordChars = '***************';
+
+/* authentication types */
+export const sqlLogin = 'SqlLogin';
+export const integrated = 'Integrated';
+export const azureMFA = 'AzureMFA';
+