Changes to Chat Completions

added the optional property code to the response with the 422 status

added the new optional request property metadata

removed the request property metadata

added the new optional request property metadata

removed the request property metadata

added the new optional request property metadata

deleted the header request parameter Idempotency-Key

added the new optional header request parameter Idempotency-Key

api operation id chat_completions_api_v1_chat_completions_post removed and replaced with chat-chat_completions

endpoint added