chore: match js sample app name conventions

Author: srtaalej

listeners/assistant/__init__.py

@@ -1,7 +1,7 @@
 from slack_bolt import App, Assistant
 
-from .assistant_thread_started import start_assistant_thread
-from .message import respond_in_assistant_thread
+from .assistant_thread_started import assistant_thread_started
+from .message import message
 
 
 # Refer to https://docs.slack.dev/tools/bolt-python/concepts/ai-apps#assistant for more details on the Assistant class

listeners/assistant/assistant_thread_started.py

@@ -4,7 +4,7 @@
 from slack_bolt import Say, SetSuggestedPrompts
 
 
-def start_assistant_thread(
+def assistant_thread_started(
     say: Say,
     set_suggested_prompts: SetSuggestedPrompts,
     logger: Logger,

listeners/assistant/message.py

@@ -9,7 +9,7 @@
 from ..views.feedback_block import create_feedback_block
 
 
-def respond_in_assistant_thread(
+def message(
     client: WebClient,
     context: BoltContext,
     logger: Logger,