preload database when database node is expanded (#1690)

src/Microsoft.SqlTools.ServiceLayer/SqlContext/SqlToolsSettingsValues.cs

@@ -22,6 +22,7 @@ namespace Microsoft.SqlTools.ServiceLayer.SqlContext
                 IntelliSense = new IntelliSenseSettings();
                 QueryExecutionSettings = new QueryExecutionSettings();
                 Format = new FormatterSettings();
+                TableDesigner = new TableDesignerSettings();
             }
         }
 
@@ -48,5 +49,11 @@ namespace Microsoft.SqlTools.ServiceLayer.SqlContext
         /// </summary>
         [JsonProperty("objectExplorer")]
         public ObjectExplorerSettings ObjectExplorer { get; set; }
+
+        /// <summary>
+        /// Gets or sets the table designer settings
+        /// </summary>
+        [JsonProperty("tableDesigner")]
+        public TableDesignerSettings TableDesigner { get; set; }
     }
 }

src/Microsoft.SqlTools.ServiceLayer/SqlContext/TableDesignerSettings.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.SqlContext
+{
+    /// <summary>
+    /// Contract for receiving table designer settings as part of workspace settings
+    /// </summary>
+    public class TableDesignerSettings
+    {
+        /// <summary>
+        /// Whether the database model should be preloaded to make the initial launch quicker.
+        /// </summary>
+        public bool PreloadDatabaseModel { get; set; } = false;
+    }
+}