Python: [BREAKING] changed AIFunction to FunctionTool and @ai_function to @tool (#3413)

* changed AIFunction to FunctionTool and @ai_function to @tool

* test and mypy fixes

* mypy fix

* switch function tool to always_require

* fix noop

* fix github copilot imports

* test fixes

* fix ollama test

* fixes for tests

* fix tests

* reverted change to always_require and extended timeout

* fix test

python/samples/demos/chatkit-integration/app.py

@@ -19,6 +19,7 @@ import uvicorn
 
 # Agent Framework imports
 from agent_framework import AgentResponseUpdate, ChatAgent, ChatMessage, FunctionResultContent, Role
+from agent_framework import tool
 from agent_framework.azure import AzureOpenAIChatClient
 
 # Agent Framework ChatKit integration
@@ -130,7 +131,8 @@ async def stream_widget(
 
     yield ThreadItemDoneEvent(type="thread.item.done", item=widget_item)
 
-
+# NOTE: approval_mode="never_require" is for sample brevity. Use "always_require" in production; see samples/getting_started/tools/function_tool_with_approval.py and samples/getting_started/tools/function_tool_with_approval_and_threads.py.
+@tool(approval_mode="never_require")
 def get_weather(
     location: Annotated[str, Field(description="The location to get the weather for.")],
 ) -> str:
@@ -168,14 +170,14 @@ def get_weather(
     )
     return WeatherResponse(text, weather_data)
 
-
+@tool(approval_mode="never_require")
 def get_time() -> str:
     """Get the current UTC time."""
     current_time = datetime.now(timezone.utc)
     logger.info("Getting current UTC time")
     return f"Current UTC time: {current_time.strftime('%Y-%m-%d %H:%M:%S')} UTC"
 
-
+@tool(approval_mode="never_require")
 def show_city_selector() -> str:
     """Show an interactive city selector widget to the user.