Add extra delete database functionality to DatabaseHandler (#2168)

* Also fixed connections not being properly closed in Detach operations
* Fixed errors being thrown in InitializeObjectView because certain db property fields are not supported against Azure

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

@@ -0,0 +1,40 @@
+//
+// 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 DropDatabaseRequestParams : GeneralRequestDetails
+    {
+        /// <summary>
+        /// SFC (SMO) URN identifying the object  
+        /// </summary>
+        public string ObjectUrn { get; set; }
+        /// <summary>
+        /// URI of the underlying connection for this request
+        /// </summary>
+        public string ConnectionUri { get; set; }
+        /// <summary>
+        /// Whether to drop active connections to this database
+        /// </summary>
+        public bool DropConnections { get; set; }
+        /// <summary>
+        /// Whether to delete the backup and restore history for this database
+        /// </summary>
+        public bool DeleteBackupHistory { get; set; }
+        /// <summary>
+        /// Whether to generate a TSQL script for the operation instead of dropping the database
+        /// </summary>
+        public bool GenerateScript { get; set; }
+    }
+
+    public class DropDatabaseRequest
+    {
+        public static readonly RequestType<DropDatabaseRequestParams, string> Type = RequestType<DropDatabaseRequestParams, string>.Create("objectManagement/dropDatabase");
+    }
+}