Suggested Function Rename for Clarity: openai-image-editing

[olcayhan]

https://github.com/supabase/supabase/tree/master/examples/edge-functions/supabase/functions/openai-image-generation

I noticed that this function actually performs image editing rather than pure image generation, as it accepts multiple images for editing purposes. It might be clearer to rename it to openai-image-editing to better reflect its functionality.