[Feature Request] Add an exmaple to use open source model based on the CAMEL integration

[dandansamax]

Required prerequisites

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Motivation

Currently we only support three commercial backend model. It's important to add open source models to allow more type of agents.

Solution

Use the interagted CAMEL agent to create an example to show how to use the open source model. It can directly called from the integrated vllm package from the CAMEL model.

Additional context

No response