allow multiple models to be specified at once

[zeke]

I want to use this tool to create a new Node app that uses 2 or more Replicate models, in this case LLaVA and SDXL:

npm create replicate copycat --models=yorickvp/llava-v1.6-34b,stability-ai/sdxl

Bonus points if it somehow stitches the models together into a pipeline, using output from the first model and input to the next. Sounds complicated though... 🤔