[Feature]: Rename model naming from `modelname` to `provider/modelname`

[Vedantsahai18]

trafficstars

🔖 Feature description

Easier to switch between same model name provided by different providers. Also easier to add new models.

🎤 Why is this feature needed ?

No response

✌️ How do you aim to achieve this?

No response

👀 Have you searched issues and PRs to see if this feature request has been raised before?

• [x] I checked and didn't find similar issue