simplify drop object request handler (#1953)

* simplify drop object request handler

* fix test cases

* fix issues

* update strings

* fix error

* fix error

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

@@ -0,0 +1,32 @@
+//
+// 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 DropRequestParams : GeneralRequestDetails
+    {
+        /// <summary>
+        /// SFC (SMO) URN identifying the object  
+        /// </summary>
+        public string ObjectUrn { get; set; }
+        /// <summary>
+        /// Connection uri
+        /// </summary>
+        public string ConnectionUri { get; set; }
+        /// <summary>
+        /// Whether to throw an error if the object does not exist. The default value is false.
+        /// </summary>
+        public bool ThrowIfNotExist { get; set; } = false;
+    }
+
+    public class DropRequest
+    {
+        public static readonly RequestType<DropRequestParams, bool> Type = RequestType<DropRequestParams, bool>.Create("objectManagement/drop");
+    }
+}