[Enhancement] if the user specifies tools or returns files the msgs and workdir needs to be setup correctly eg the files should become available locally in workdir

[gagb]

extend GPTAssistantAgent so that:

• if a code interpreter creates a file, it should become available locally
• if I have a local file, code interpreter should be able to use it

https://platform.openai.com/docs/assistants/tools/reading-images-and-files-generated-by-code-interpreter