Rename AI Agent packages to use Microsoft.Agents.AI (#913)

* Rename AI Agent packages to use Microsoft.Agents.AI

* Fix for build

* Fix formatting

* Fix formatting

* Ignore in VSTHRD200 in migration samples

* Ignore in VSTHRD200 in migration samples

* Add some missing projects and run format

* Fix build errors

* Address code review feedback

* Fix merge issues

---------

Co-authored-by: Mark Wallace <markwallace@microsoft.com>

dotnet/tests/Microsoft.Extensions.AI.Agents.Hosting.UnitTests/AgentActorTests.cs

@@ -5,6 +5,7 @@ using System.Collections.Generic;
 using System.Text.Json;
 using System.Threading;
 using System.Threading.Tasks;
+using Microsoft.Agents.AI;
 using Microsoft.Extensions.AI.Agents.Runtime;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Logging.Abstractions;

dotnet/tests/Microsoft.Extensions.AI.Agents.Hosting.UnitTests/AgentProxyTests.cs

@@ -6,6 +6,7 @@ using System.Linq;
 using System.Text.Json;
 using System.Threading;
 using System.Threading.Tasks;
+using Microsoft.Agents.AI;
 using Microsoft.Extensions.AI.Agents.Runtime;
 using Moq;
 

dotnet/tests/Microsoft.Extensions.AI.Agents.Hosting.UnitTests/AgentProxyThreadTests.cs

@@ -4,6 +4,7 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
+using Microsoft.Agents.AI;
 
 namespace Microsoft.Extensions.AI.Agents.Hosting.UnitTests;
 

dotnet/tests/Microsoft.Extensions.AI.Agents.Hosting.UnitTests/HostApplicationBuilderAgentExtensionsTests.cs

@@ -2,6 +2,7 @@
 
 using System;
 using System.Linq;
+using Microsoft.Agents.AI;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
 using Moq;