Simplify Object Management APIs (#2015)

* unify requests-wip

* wip

* unify api

* fix test

* add credential handler

* fix credential handler issue.

* generic type update

* fix scripting for user

src/Microsoft.SqlTools.ServiceLayer/ObjectManagement/Contracts/InitializeViewRequest.cs

@@ -0,0 +1,48 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+#nullable disable
+using Microsoft.SqlTools.Hosting.Protocol.Contracts;
+using Microsoft.SqlTools.Utility;
+
+namespace Microsoft.SqlTools.ServiceLayer.ObjectManagement.Contracts
+{
+    public class InitializeViewRequestParams : GeneralRequestDetails
+    {
+        /// <summary>
+        /// The connection uri.
+        /// </summary>
+        public string ConnectionUri { get; set; }
+        /// <summary>
+        /// The target database name.
+        /// </summary>
+        public string Database { get; set; }
+        /// <summary>
+        /// The object type.
+        /// </summary>
+        public SqlObjectType ObjectType { get; set; }
+        /// <summary>
+        /// Whether the view is for a new object.
+        /// </summary>
+        public bool IsNewObject { get; set; }
+        /// <summary>
+        /// The object view context id.
+        /// </summary>
+        public string ContextId { get; set; }
+        /// <summary>
+        /// Urn of the parent object.
+        /// </summary>
+        public string ParentUrn { get; set; }
+        /// <summary>
+        /// Urn of the object. Only set when the view is for an existing object.
+        /// </summary>
+        public string ObjectUrn { get; set; }
+    }
+
+    public class InitializeViewRequest
+    {
+        public static readonly RequestType<InitializeViewRequestParams, SqlObjectViewInfo> Type = RequestType<InitializeViewRequestParams, SqlObjectViewInfo>.Create("objectManagement/initializeView");
+    }
+}