Add change password function and handling (#1771)

* added ChangePassword to connectionService

* added changepasswordparams

* added more code

* added more changes to connectionservice

* added more changes

* added small test

* added changepasswordrequest

* added different ServerConnection constructor

* consolidated changepassword

* added exception catch

* added passwordChangeFail params

* added changePassword to it's own function

* simplified changePassword

* made fixes to test

* added new test

* added one additional connection test

* added response callback

* removed unnecessary SendError

* added localized empty password error

* added updated error messages

* added small fix to check

* added changes based on feedback

* added minor change

* fix tests

* renamed messages to errorDetails

* simplified error message

* small change to connectionservice message

* error message change

* added environment newline

* added error retry messages to STS

* added regex

* added newline handling

src/Microsoft.SqlTools.ServiceLayer/Connection/Contracts/ChangePasswordParams.cs

@@ -0,0 +1,18 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+namespace Microsoft.SqlTools.ServiceLayer.Connection.Contracts
+{
+    /// <summary>
+    /// Parameters for the Change Password Request.
+    /// </summary>
+    public class ChangePasswordParams : ConnectParams
+    {
+        /// <summary>
+        /// The password to change the account of the connection to.
+        /// </summary>
+        public string NewPassword { get; set; }
+    }
+}