SambaNova LangChain Integration

An integration package connecting SambaNova and LangChain, enabling developers to leverage SambaNova's large language models. It provides chat models (`ChatSambaNova`) and embedding models (`SambaNovaEmbeddings`) for seamless interaction with SambaCloud and SambaStack. The current version is 1.1.0, with a regular release cadence that incorporates new features and ensures compatibility with LangChain updates.