.NET: Rename workflows projects (#975)

* Renaming Microsoft.Agent.Workflows to Microsoft.Agents.AI.Workflows

* Removing local settings.

* Removing remining old files from merge.

dotnet/src/Microsoft.Agents.AI.Workflows/WorkflowThread.cs

@@ -0,0 +1,49 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using System;
+using System.Text.Json;
+using Microsoft.Agents.AI;
+using Microsoft.Extensions.AI;
+using Microsoft.Shared.Diagnostics;
+
+namespace Microsoft.Agents.AI.Workflows;
+
+internal sealed class WorkflowThread : AgentThread
+{
+    public WorkflowThread(string workflowId, string? workflowName, string runId)
+    {
+        this.MessageStore = new();
+        this.RunId = Throw.IfNullOrEmpty(runId, nameof(runId));
+    }
+
+    public WorkflowThread(JsonElement serializedThread, JsonSerializerOptions? jsonSerializerOptions = null)
+    {
+        throw new NotImplementedException("Pending Checkpointing work.");
+    }
+
+    public string RunId { get; }
+    public int Halts { get; }
+
+    public string ResponseId => $"{this.RunId}@{this.Halts}";
+
+    public override JsonElement Serialize(JsonSerializerOptions? jsonSerializerOptions = null)
+        => throw new NotImplementedException("Pending Checkpointing work.");
+
+    public AgentRunResponseUpdate CreateUpdate(params AIContent[] parts)
+    {
+        Throw.IfNullOrEmpty(parts);
+
+        AgentRunResponseUpdate update = new(ChatRole.Assistant, parts)
+        {
+            CreatedAt = DateTimeOffset.UtcNow,
+            MessageId = Guid.NewGuid().ToString("N"),
+        };
+
+        this.MessageStore.AddMessages(update.ToChatMessage());
+
+        return update;
+    }
+
+    /// <inheritdoc/>
+    public WorkflowMessageStore MessageStore { get; }
+}