Support vision

[seawolflin]

[lakf]

@JanCong if you get this up to date I think it may be ready to merge.

[fedorBir]

@seawolflin is this ever going to be merged?

[Vavaste]

@seawolflin it works great, i also switched to rxjava3 instead of 2 on this repo if someone needs it. Basically is your repo with rxjava3 retrofit

https://github.com/Vavaste/openai-java-rxjava3