[EPIC]: Create dynamic code preview templates for each model in playground

[cobycloud]

The code preview should dynamically generate a code preview based on a template and then it should swap in the correct Models, Messages, and LLM_KWARGS

• create a basic template for the code preview #12
• enable the ability to swap the models of the code preview #13
• enable the ability to swap the messages of the code preview #14
• enable the ability to swap the LLM_kwargs of the code preview #15