make agent async safe

[emrgnt-cmplxty]

[!IMPORTANT] Made the agent system asynchronous safe by introducing locks and modifying conversation handling to be asynchronous, with minor logging and state management changes.

• Agent System:
  • Introduced asyncio.Lock in Conversation class in agent.py to ensure thread safety.
  • Modified add_message and get_messages in Conversation to be asynchronous.
  • Updated arun and process_llm_response methods in R2RAgent and R2RStreamingAgent to handle asynchronous message operations.
• Retrieval Service:
  • Added logging for received queries in retrieval_service.py.
• Search Pipeline:
  • Adjusted state management in search_pipeline.py to use request_state instead of self.state.
• Web App:
  • Changed agentUrl in index.tsx to use local server URL.

^{This description was created by for a209fb0169b3147a1a8c23a92254b34c856ebb41. It will automatically update as commits are pushed.}