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When using callbacks, there are times when callbacks can be added redundantly: for instance sometimes you might need to create an llm with specific callbacks, but then also create and agent that uses a chain that has those callbacks already set. This means that "callbacks" might get passed down again to the llm at predict() time, resulting in duplicate calls to the `on_llm_start` callback. For the sake of simplicity, I made it so that langchain never adds an exact handler/callbacks object in `add_handler`, thus avoiding the duplicate handler issue. Tagging @hwchase17 for callback review --------- Co-authored-by: Bagatur <baskaryan@gmail.com>