langchain

916332ef - ibm: added partners package `langchain_ibm`, added llm (#16512)

ibm: added partners package `langchain_ibm`, added llm (#16512) - **Description:** Added `langchain_ibm` as an langchain partners package of IBM [watsonx.ai](https://www.ibm.com/products/watsonx-ai) LLM provider (`WatsonxLLM`) - **Dependencies:** [ibm-watsonx-ai](https://pypi.org/project/ibm-watsonx-ai/), - **Tag maintainer:** : --------- Co-authored-by: Erick Friis <erick@langchain.dev>