[ADF-4911] migrate identity role service (#5096)

* migrate IdentityRoleService implementation

* update unit tests

* move interfaces to the origin

* move models to proper places

* migrate model to interface

* fix test

* update docs

lib/core/models/identity-user.model.ts

@@ -0,0 +1,27 @@
+/*!
+ * @license
+ * Copyright 2019 Alfresco Software, Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export interface IdentityUserModel {
+    id?: string;
+    firstName?: string;
+    lastName?: string;
+    email?: string;
+    username?: string;
+    createdTimestamp?: any;
+    emailVerified?: boolean;
+    enabled?: boolean;
+}