Modify the calling method of openai, and use function calling to reduce the size of the first input token.

[hejianjun]

Updated the interface of openai, refer to.https://cookbook.openai.com/examples/how_to_call_functions_with_chat_models Let ChatGPT actively obtain the data structure of the table The next step is to add an automatic option to the front-end component of the selection table, which can automatically obtain the database structure to write sql when selecting.