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218b4e07 - community: fix some features on Naver ChatModel & embedding model (#28228)

community: fix some features on Naver ChatModel & embedding model (#28228) # Description - adding stopReason to response_metadata to call stream and astream - excluding NCP_APIGW_API_KEY input required validation - to remove warning Field "model_name" has conflict with protected namespace "model_". cc. @vbarda