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.DataProtocol.Contracts/InitializeRequest.cs

@@ -0,0 +1,94 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+using System;
+using Microsoft.SqlTools.DataProtocol.Contracts.Common;
+using Microsoft.SqlTools.Hosting.Contracts;
+
+namespace Microsoft.SqlTools.DataProtocol.Contracts
+{
+    public enum TraceOptions
+    {
+        Off,
+        Messages,
+        Verbose
+    }
+    
+    /// <summary>
+    /// Parameters provided with an initialize request
+    /// </summary>
+    /// <remarks>
+    /// This is the initialize request parameters used by VSCode language server. These are
+    /// provided here for convenience of implementing initialization request handlers when the
+    /// server is expected to be used by the VSCode language client. You are not obligated to use
+    /// these initialization params when writing your server, nor are you even obligated to
+    /// implement an initialize handler. However, the VSCode language client will always send an
+    /// initialize request when starting the server and will not consider the server "ready" until
+    /// a response to the init request has been received.
+    /// </remarks>
+    public class InitializeParameters
+    {
+        /// <summary>
+        /// Capabilities of the initializing client
+        /// </summary>
+        public ClientCapabilities.ClientCapabilities Capabilities { get; set; }
+        
+        /// <summary>
+        /// Root path of the workspace, is null if no folder is open.
+        /// </summary>
+        /// <remarks>
+        /// This function has been deprecated in favor of workspace folders
+        /// </remarks>
+        [Obsolete("Deprecated in favor of rootUri")]
+        public string RootPath { get; set; }
+        
+        /// <summary>
+        /// Root URI of the workspace, is null if no folder is open. If both <see cref="RootPath"/>
+        /// and <see cref="RootUri"/> are set, <see cref="RootUri"/> should be used.
+        /// </summary>
+        /// <remarks>
+        /// This function has been deprecated in favor of workspace folders
+        /// </remarks>
+        [Obsolete("Deprecated in favor of workspace folders")]
+        public string RootUri { get; set; }
+        
+        /// <summary>
+        /// Initial trace setting. If omitted, trace is disabled <see cref="TraceOptions.Off"/>
+        /// </summary>
+        public TraceOptions? Trace { get; set; }
+        
+        /// <summary>
+        /// Workspace folders that are open at the time of initialization. If this is provided, it
+        /// takes precedence over <see cref="RootUri"/> and <see cref="RootPath"/>
+        /// </summary>
+        public WorkspaceFolder[] WorkspaceFolders { get; set; }
+    }
+
+    /// <summary>
+    /// Parameters provided as a result to an initialize request
+    /// </summary>
+    /// <remarks>
+    /// This is the initialize result parameters used by VSCode language server. These are provided
+    /// for convenience of implementing initialization request handlers when the server is expected
+    /// to be used by the VSCode language client. You are not obligated to use these initialization
+    /// params when writing your server, nor are you even obligated to implement an initialize
+    /// handler. However, the VSCode language client will always send an initialize request when
+    /// starting the server and will not consider the server "ready" until a response to the init
+    /// request has been received.
+    /// </remarks>
+    public class InitializeResponse
+    {
+        /// <summary>
+        /// Capabilities that this server provides
+        /// </summary>
+        public ServerCapabilities.ServerCapabilities Capabilities { get; set; }
+    }
+
+    public class InitializeRequest
+    {
+        public static readonly RequestType<InitializeParameters, InitializeResponse> Type =
+            RequestType<InitializeParameters, InitializeResponse>.Create("initialize");
+    }
+}