SQL Agent configuration for Operators, Alerts and Proxies (WIP) (#621)

* Initial non-refactored SQL Agent alert classes (WIP)

* Move agent classes into subdirectories

* Refactor the agent config code a bit more

* Add more implementation for handlers

* Add more code to the create alert handler

* Clean up agent alert class

* Clean up alert methods a bit

* Initial Operator contracts

* Additonal SQL Agent config changes

* More Proxy config cleanup

* Cleanup AgentProxy class

* Additional cleanups

* Run SRGen

* Add security service to create credential objects

test/Microsoft.SqlTools.ServiceLayer.IntegrationTests/Security/SecurityServiceTests.cs

@@ -0,0 +1,54 @@
+//
+// 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;
+using Microsoft.SqlTools.ServiceLayer.Connection;
+using Microsoft.SqlTools.ServiceLayer.IntegrationTests.Utility;
+using Microsoft.SqlTools.ServiceLayer.Security;
+using Microsoft.SqlTools.ServiceLayer.Security.Contracts;
+using Microsoft.SqlTools.ServiceLayer.Test.Common;
+using Microsoft.SqlTools.ServiceLayer.Workspace.Contracts;
+using Moq;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using Xunit;
+using static Microsoft.SqlTools.ServiceLayer.IntegrationTests.Utility.LiveConnectionHelper;
+
+namespace Microsoft.SqlTools.ServiceLayer.IntegrationTests.Security
+{
+    /// <summary>
+    /// Tests for the security service component
+    /// </summary>
+    public class SecuritygServiceTests
+    {
+        /// <summary>
+        /// Verify the script object request
+        /// </summary>
+        [Fact]
+        public async Task TestHandleCreateCredentialRequest()
+        {
+            using (SelfCleaningTempFile queryTempFile = new SelfCleaningTempFile())
+            {
+                var createContext = new Mock<RequestContext<CreateCredentialResult>>();
+                var connectionResult = await LiveConnectionHelper.InitLiveConnectionInfoAsync("master", queryTempFile.FilePath);
+
+                var service = new SecurityService();
+                var credential = new CredentialInfo()
+                {                
+                };
+
+                await service.HandleCreateCredentialRequest(new CreateCredentialParams
+                {
+                    OwnerUri = connectionResult.ConnectionInfo.OwnerUri,
+                    Credential = credential
+                }, createContext.Object);
+
+                createContext.VerifyAll();
+            }
+        }  
+    }
+}