Currently supported models

[gilcu3]

Hi all, currently the bot supports quite a few models with different combinations of features (vision, functions, context window, price). I think it would be good if we deprecate all the ones that are superseded with new ones, which would allow making the code simpler. We would need to agree on which models those should be. A possible list would be:

• gpt-4o (vision + functions)
• gpt-4-turbo (vision + functions)
• gpt-3.5-turbo (functions)
• dall-e-3, dall-e-2 (for editing, else not needed)
• tts-1, tts-1-hd
• whisper-1

What do you think (@n3d1117 and others )? I could work on a PR to make it happen after we settle on such a list.