Streaming Support in LangChain

LangChain has introduced streaming support to enhance user experience in large language model (LLM) applications. This feature helps reduce perceived latency by returning output tokens one at a time, rather than all at once. The chat-langchain repository now includes streaming and async execution capabilities, which can serve as templates for developers building advanced chat and question/answering applications. Streaming support is currently available for the OpenAI implementation of LLMs, with plans to extend it to other LLMs in the future.