Add chat api format with standard open ai chat format

[elronbandel]

No description provided.

[yoavkatz]

@elronbandel - I think we should make this self contained

1. Add a HF inference engine (that uses the chat API)
2. Add en example code that calls this API both as text and with image.

[OfirArviv]

• Add a HF inference engine (that uses the chat API)
• Add en example code that calls this API both as text and with image.

We should wait for Pawel pr for this. The changes to the inference engine are minimal. No need to duplicate it. Right now no one is waiting for this. Im the one who asked for it, so no pressure I think