Python: Clean up imports (#2318)

* chore: tidy imports

* Update python/packages/azurefunctions/agent_framework_azurefunctions/_errors.py

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update python/packages/azurefunctions/agent_framework_azurefunctions/_callbacks.py

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* chore: revert stub file change

* chore: trigger pre-commit hook, re-add `annotations` import

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

python/samples/getting_started/devui/weather_agent_azure/agent.py

@@ -15,9 +15,9 @@ from agent_framework import (
     FunctionInvocationContext,
     Role,
     TextContent,
+    ai_function,
     chat_middleware,
     function_middleware,
-    ai_function
 )
 from agent_framework.azure import AzureOpenAIChatClient
 from agent_framework_devui import register_cleanup
@@ -122,6 +122,7 @@ def get_forecast(
 
     return f"Weather forecast for {location}:\n" + "\n".join(forecast)
 
+
 @ai_function(approval_mode="always_require")
 def send_email(
     recipient: Annotated[str, "The email address of the recipient."],
@@ -131,6 +132,7 @@ def send_email(
     """Simulate sending an email."""
     return f"Email sent to {recipient} with subject '{subject}'."
 
+
 # Agent instance following Agent Framework conventions
 agent = ChatAgent(
     name="AzureWeatherAgent",