Add image upload and delete endpoints in server.py

[pupba]

Description

This pull request introduces new endpoints in server.py for uploading images in byte stream format and for deleting files.

Changes Made

• Added an endpoint for uploading images: POST /upload/image_stream
• Added an endpoint for deleting files: DELETE /delete-file

Notes

Please review the changes and let me know if any modifications are needed.

[ltdrdata]

I believe that functions like “delete file” should only be permitted through an extension and should not exist as a core endpoint.

[pupba]

@ltdrdata
I understand.

I thought it would be necessary to have a feature to use and remove images uploaded when using the API, so I created it.

I guess I need to remake it as an extension.

For now, I will exclude this part and try to submit the PR again.

Thank you for the good suggestion.

[ltdrdata]

What is the reason for trying to send via byte stream instead of websocket?

https://github.com/comfyanonymous/ComfyUI/blob/master/custom_nodes/websocket_image_save.py
https://github.com/comfyanonymous/ComfyUI/blob/master/script_examples/websockets_api_example_ws_images.py

[pupba]

In the project I am working on, multiple users need to receive results through the Image-text-to-Image process, and they have to upload different images each time. Since users upload images and execute workflows only when needed, I believe there is no reason to bear the overhead of WebSocket connections. Therefore, using a byte stream can be more efficient for handling the frequent and varied image uploads, as it allows for simpler and potentially faster data transmission without the overhead of maintaining a WebSocket connection.