Modify the test module, add the file upload test, and add the image edit api

[Rascal0814]

• Because the test files are all written in one file, I think it is unreasonable to make changes
• File upload test
• Add image edit api and corresponding test file
• An adjustment has been made to OpenAITestServer. The test needs to register the handler with the server

[sashabaranov]

Thank you for the PR! 🙌🏻

[sashabaranov]

Thank you for all the changes!