Rename _invoke_model_activity.py to model_invoker.py

Author: AnatoliB

samples-v2/openai_agents/durable_model_stub.py

@@ -1,5 +1,5 @@
 from __future__ import annotations
-from _invoke_model_activity import (
+from model_invoker import (
     ActivityModelInput, 
     ModelTracingInput, 
     ToolInput, 

samples-v2/openai_agents/function_app.py

@@ -43,7 +43,7 @@ def basic_hello_world_orchestrator(context):
 
 @app.activity_trigger(input_name="input")
 async def invoke_model_activity(input: str):
-    from _invoke_model_activity import ModelInvoker, ActivityModelInput
+    from model_invoker import ModelInvoker, ActivityModelInput
 
     # Deserialize input string into ActivityModelInput object
     activity_input = ActivityModelInput.from_json(input)

samples-v2/openai_agents/_invoke_model_activity.py renamed to samples-v2/openai_agents/model_invoker.py

@@ -1,8 +1,3 @@
-"""A durable activity that invokes a LLM model.
-
-Implements mapping of OpenAI datastructures to Pydantic friendly types.
-"""
-
 import enum
 import json
 from dataclasses import dataclass