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/packages/bedrock/tests/test_bedrock_settings.py

@@ -6,10 +6,10 @@ from unittest.mock import MagicMock
 
 import pytest
 from agent_framework import (
-    AIFunction,
     ChatMessage,
     ChatOptions,
     Content,
+    FunctionTool,
     Role,
 )
 from pydantic import BaseModel
@@ -42,7 +42,7 @@ def test_settings_load_from_environment(monkeypatch: pytest.MonkeyPatch) -> None
 def test_build_request_includes_tool_config() -> None:
     client = _build_client()
 
-    tool = AIFunction(name="get_weather", description="desc", func=_dummy_weather, input_model=_WeatherArgs)
+    tool = FunctionTool(name="get_weather", description="desc", func=_dummy_weather, input_model=_WeatherArgs)
     options = {
         "tools": [tool],
         "tool_choice": {"mode": "required", "required_function_name": "get_weather"},