Add AuthenticationType enum to typings (#20699)

* Add AuthenticationType enum to typings

* fix

* const

* Add comments

* fix comment

* remove unused

extensions/types/vscode-mssql.d.ts

@@ -122,11 +122,41 @@ declare module 'vscode-mssql' {
 		getServerInfo(connectionInfo: IConnectionInfo): ServerInfo
 	}
 
+		/**
+		 * Well-known Authentication types.
+		 */
+		 export const enum AuthenticationType {
+			/**
+			 * Username and password
+			 */
+			SqlLogin = 'SqlLogin',
+			/**
+			 * Windows Authentication
+			 */
+			Integrated = 'Integrated',
+			/**
+			 * Azure Active Directory - Universal with MFA support
+			 */
+			AzureMFA = 'AzureMFA',
+			/**
+			 * Azure Active Directory - Password
+			 */
+			AzureMFAAndUser = 'AzureMFAAndUser',
+			/**
+			 * Datacenter Security Token Service Authentication
+			 */
+			DSTSAuth = 'dstsAuth',
+			/**
+			 * No authentication required
+			 */
+			None = 'None'
+		}
+
 	/**
 	 * The possible values of the server engine edition
 	 * EngineEdition under https://docs.microsoft.com/sql/t-sql/functions/serverproperty-transact-sql is associated with these values
 	 */
-	 export const enum DatabaseEngineEdition {
+	export const enum DatabaseEngineEdition {
 		Unknown = 0,
 		Personal = 1,
 		Standard = 2,