Support Synthesizer Model And Trainee Model from difference providers

Hi there, I really appreciate your hard work on this project. When using the GraphGen Gradio app, I noticed that it only allows setting the base URL for both the Synthesizer and Trainee models. Running two LLMs locally is not very affordable for me, so I’m hoping for support to use different providers for the Synthesizer and Trainee models in the Gradio app.