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/LanguageServices/IBindingContext.cs

@@ -0,0 +1,81 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+using System.Threading;
+using Microsoft.SqlServer.Management.Common;
+using Microsoft.SqlServer.Management.SmoMetadataProvider;
+using Microsoft.SqlServer.Management.SqlParser.Binder;
+using Microsoft.SqlServer.Management.SqlParser.Common;
+using Microsoft.SqlServer.Management.SqlParser.MetadataProvider;
+using Microsoft.SqlServer.Management.SqlParser.Parser;
+
+namespace Microsoft.SqlTools.CoreServices.LanguageServices
+{
+    /// <summary>
+    /// The context used for binding requests
+    /// </summary>
+    public interface IBindingContext
+    {
+        /// <summary>
+        /// Gets or sets a flag indicating if the context is connected
+        /// </summary>
+        bool IsConnected { get; set; }
+
+        /// <summary>
+        /// Gets or sets the binding server connection
+        /// </summary>
+        ServerConnection ServerConnection { get; set; }
+
+        /// <summary>
+        /// Gets or sets the metadata display info provider
+        /// </summary>
+        MetadataDisplayInfoProvider MetadataDisplayInfoProvider { get; set; }
+
+        /// <summary>
+        /// Gets or sets the SMO metadata provider
+        /// </summary>
+        SmoMetadataProvider SmoMetadataProvider { get; set; }
+
+        /// <summary>
+        /// Gets or sets the binder
+        /// </summary>
+        IBinder Binder { get; set; }
+
+        /// <summary>
+        /// Gets the binding lock object
+        /// </summary>
+        ManualResetEvent BindingLock { get; }
+
+        /// <summary>
+        /// Gets or sets the binding operation timeout in milliseconds
+        /// </summary>
+        int BindingTimeout { get; set; }
+
+        /// <summary>
+        /// Gets or sets the current connection parse options
+        /// </summary>
+        ParseOptions ParseOptions { get; }
+
+        /// <summary>
+        /// Gets or sets the current connection server version
+        /// </summary>
+        ServerVersion ServerVersion { get; }
+
+        /// <summary>
+        /// Gets or sets the database engine type
+        /// </summary>
+        DatabaseEngineType DatabaseEngineType {  get; }
+
+        /// <summary>
+        /// Gets or sets the T-SQL version
+        /// </summary>
+        TransactSqlVersion TransactSqlVersion { get; }
+
+        /// <summary>
+        /// Gets or sets the database compatibility level
+        /// </summary>
+        DatabaseCompatibilityLevel DatabaseCompatibilityLevel { get; }
+    }
+}