[Feat]: OpenRouter support

**Description**
Support for models on Openrouter.

**Use Case**
There are  plenty of cheap and even free AI models, during my experimentation with AI, I only use free AI models on Openrouter.

Suggestion:
Probably, openrouter models are compatible with openai models, or you can use the same openai package with openrouter. I am not sure, but in python worked out.
