LiteLLM Support #2615

Is your feature request related to a problem? Please describe.
Kind of, I would like to connect litellm to agent's models or the copilot in the sim ai.

Describe the solution you'd like
I use liteLLM to connect my github copilot provider and use the models there from claude code. I want similar functionality for the sim ai models as well since github copilot actually cost request based instead of tokens. This helps to reduce costs when carefully design workflows. This will not only provider wide selection of models in agents but also in the sim.ai's copilot as well.