Move unused forked code to external directory (#1192)

* Move unused forked code to external directory

* Fix SLN build errors

* Add back resource provider core since it's referenced by main resource provider project

* Update PackageProjects step of pipeline

external/Microsoft.SqlTools.CoreServices/SqlContext/ObjectExplorerSettings.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.
+//
+
+namespace Microsoft.SqlTools.CoreServices.SqlContext
+{
+    /// <summary>
+    /// Contract for receiving object explorer settings as part of workspace settings
+    /// </summary>
+    public class ObjectExplorerSettings
+    {
+        public static int DefaultCreateSessionTimeout = 45;
+        public static int DefaultExpandTimeout = 45;
+
+        public ObjectExplorerSettings()
+        {
+            CreateSessionTimeout = DefaultCreateSessionTimeout;
+            ExpandTimeout = DefaultExpandTimeout;
+        }
+
+        /// <summary>
+        /// Number of seconds to wait before fail create session request with timeout error
+        /// </summary>
+        public int CreateSessionTimeout { get; set; }
+
+        /// <summary>
+        /// Number of seconds to wait before fail expand request with timeout error
+        /// </summary>
+        public int ExpandTimeout { get; set; }
+    }
+}