Python: [BREAKING] Move workflow to main package (#767)

* Move workflow to main package

* Remove workflow specific unit test config

* Remove workflow-specific version info

* Revert unintended telemetry changes

* Removed the obsolete packages/workflow/tests target

* Rename dir workflow to _workflow

* Fix test imports

python/samples/getting_started/workflow/checkpoint/checkpoint_with_resume.py

@@ -5,19 +5,20 @@ import os
 from pathlib import Path
 from typing import Any
 
-from agent_framework import ChatMessage, Role
-from agent_framework.azure import AzureChatClient
-from agent_framework.workflow import (
+from agent_framework import (
     AgentExecutor,
     AgentExecutorRequest,
     AgentExecutorResponse,
+    ChatMessage,
     Executor,
     FileCheckpointStorage,
+    Role,
     WorkflowBuilder,
     WorkflowCompletedEvent,
     WorkflowContext,
     handler,
 )
+from agent_framework.azure import AzureChatClient
 from azure.identity import AzureCliCredential
 
 """