Streaming Events: Introducing a new `stream_events` method

Streaming is an important part of most LLM apps. Both streaming of individual tokens, as well as streaming of events that happen along the way. We recently introduced `stream_events` - a new method to make this as easy possible. This video goes over how to use that method, as well as how to best use traditional streaming methods. This has a particular focus on agents. General streaming docs: https://python.langchain.com/docs/expression_language/streaming Agent Executor streaming: https://python.langchain.com/docs/modules/agents/how_to/streaming LangGraph streaming: https://github.com/langchain-ai/langgraph/blob/main/examples/streaming-tokens.ipynb