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408a930d - community: Add Sambanova Cloud Chat model community integration (#26333)

community: Add Sambanova Cloud Chat model community integration (#26333) **Description:** : Add SambaNova Cloud Chat model community integration Includes - chat model integration (following Standardize ChatModel docstrings) - tests - docs usage notebook (following Standardize ChatModel integration docs) https://cloud.sambanova.ai/ --------- Co-authored-by: luisfucros <luisfucros@gmail.com> Co-authored-by: ccurme <chester.curme@gmail.com>