Implement `with_data` API for Edge-Based Data Flow in Task DAGs

[andylizf]

1. Implement with_data API

   • Add with_data(path, size_gb=...) method on task edges to specify unique data paths for each downstream task.
   • Example usage:

     (preprocess >> train_a).with_data('/data/model_a', size_gb=2.0)
     (preprocess >> train_b).with_data('/data/model_b', size_gb=2.0)

2. Update YAML Configuration

   • Modify YAML format to support edge-based path definitions between tasks.

3. Add Documentation and Examples

   • Document usage of with_data in both code and YAML, with example configurations.