Tde migration integration (#1806)

Adding certificate migration for encrypted databases.

Uses notifications to send events back to the client every time each database certificate is migrated.

src/Microsoft.SqlTools.ServiceLayer/Migration/Contracts/CertificateMigrationProgressEvent.cs

@@ -0,0 +1,44 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+using Microsoft.SqlTools.Hosting.Protocol.Contracts;
+
+namespace Microsoft.SqlTools.ServiceLayer.Migration.Contracts
+{
+    /// <summary>
+    /// Parameters for the certificate migration progress event
+    /// </summary>
+    public class CertificateMigrationProgressParams
+    {
+        /// <summary>
+        /// Database name
+        /// </summary>
+        public string Name { get; set; }
+
+        /// <summary>
+        /// Message related to the success status. true should describe a positive outcome. false should have an error.
+        /// </summary>
+        public string Message { get; set; }
+
+        /// <summary>
+        /// Result of migration
+        /// </summary>
+        public bool Success { get; set; }
+    }
+
+
+    /// <summary>
+    /// Create a certificate migration request. This should be register at the client.
+    /// </summary>
+    public class CertificateMigrationProgressEvent
+    {
+        /// <summary>
+        /// Name and parameters for the event definition.
+        /// </summary>
+        public static readonly
+            EventType<CertificateMigrationProgressParams> Type =
+                EventType<CertificateMigrationProgressParams>.Create("migration/tdemigrationprogress");
+    }
+}

src/Microsoft.SqlTools.ServiceLayer/Migration/Contracts/CertificateMigrationRequest.cs

@@ -0,0 +1,111 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+using System.Collections.Generic;
+using Microsoft.SqlTools.Hosting.Protocol.Contracts;
+
+namespace Microsoft.SqlTools.ServiceLayer.Migration.Contracts
+{
+    /// <summary>
+    /// Parameters for the certificate migration operation
+    /// </summary>
+    public class CertificateMigrationParams
+    {
+        /// <summary>
+        /// List of databses to migrate the certificates
+        /// </summary>
+        public List<string> EncryptedDatabases { get; set; } = new List<string>();
+
+        /// <summary>
+        /// Source connection string to the server
+        /// </summary>
+        public string SourceSqlConnectionString { get; set; }
+
+        /// <summary>
+        /// Target subscription id
+        /// </summary>
+        public string TargetSubscriptionId { get; set; }
+
+        /// <summary>
+        /// Target resource group name
+        /// </summary>
+        public string TargetResourceGroupName { get; set; }
+
+        /// <summary>
+        /// Target manages instance name
+        /// </summary>
+        public string TargetManagedInstanceName { get; set; }
+
+        /// <summary>
+        /// Place where certificates will be exported
+        /// </summary>
+        public string NetworkSharePath { get; set; }
+
+        /// <summary>
+        /// Domain for the user credentials able to read from the shared path
+        /// </summary>
+        public string NetworkShareDomain { get; set; }
+
+        /// <summary>
+        /// Username for the credentials able to read from the shared path
+        /// </summary>
+        public string NetworkShareUserName { get; set; }
+
+        /// <summary>
+        /// Password for the credentials able to read from the shared path
+        /// </summary>
+        public string NetworkSharePassword { get; set; } 
+        
+        /// <summary>
+        /// Access token for the ARM client
+        /// </summary>
+        public string AccessToken { get; set; }
+    }
+
+    /// <summary>
+    /// Result for the certificate migration operation
+    /// </summary>
+    public class CertificateMigrationResult
+    {
+        /// <summary>
+        /// List of the status of each certificate migration result attempted.
+        /// </summary>
+        public List<CertificateMigrationEntryResult> MigrationStatuses { get; set; } = new List<CertificateMigrationEntryResult>();
+    }
+
+    /// <summary>
+    /// Result for an individual database certificate migration
+    /// </summary>
+    public class CertificateMigrationEntryResult
+    {
+        /// <summary>
+        /// The name of the database this result represent
+        /// </summary>
+        public string DbName { get; set; }
+
+        /// <summary>
+        /// The result of the migration.
+        /// </summary>
+        public bool Success { get; set; }
+
+        /// <summary>
+        /// Description of the success status or the error message encountered when the migration was not successful
+        /// </summary>
+        public string Message { get; set; }
+    }
+
+    /// <summary>
+    /// Certificate migration request definition
+    /// </summary>
+    public class CertificateMigrationRequest
+    {
+        /// <summary>
+        /// Name, parameter and return type for the certicate migration operation
+        /// </summary>
+        public static readonly
+            RequestType<CertificateMigrationParams, CertificateMigrationResult> Type =
+                RequestType<CertificateMigrationParams, CertificateMigrationResult>.Create("migration/tdemigration");
+    }
+}