Deploying custom ComfyUI workflows as APIs

The new feature in Baseten allows users to deploy custom ComfyUI workflows as APIs, enabling easier integration and deployment of ComfyUI models. The `build_commands` feature enables the packaging of custom nodes and model checkpoints within a ComfyUI workflow, reducing cold start times for container builds. Users can now easily modify existing ComfyUI workflows to an API-compatible format using handlebars templates, and deploy them as production-grade API services on Baseten. This new feature aims to provide an excellent developer experience around ComfyUI deployments.