WIP - Replace Kahns level based with loop(like in-proc)

dotnet/samples/DurableAgents/ConsoleApps/12_WorkflowLoop/README.md

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+# Workflow Loop Sample
+
+This sample demonstrates how to run a cyclic workflow (containing loops) as a durable orchestration.
+
+## Overview
+
+The workflow iteratively improves a slogan based on AI feedback until it meets quality criteria.
+
+### Executors
+
+- **SloganWriter** - Generates slogans using AI (handles string and FeedbackResult)
+- **FeedbackProvider** - Evaluates slogans (calls YieldOutput to accept, SendMessage to loop)
+
+## Key Concepts
+
+- Cyclic Workflow Support (back-edges)
+- Multi-Type Executor Handlers
+- Message Routing via SendMessageAsync
+- Workflow Termination via YieldOutputAsync
+
+## Running
+
+Set AZURE_OPENAI_ENDPOINT and run: dotnet run