Metaflow Torchrun Integration

Metaflow-torchrun is a Python library that provides a `@torchrun` decorator to enable distributed PyTorch training within Metaflow steps. It abstracts away the complexities of launching and managing `torchrun` processes, allowing users to integrate distributed ML workflows seamlessly into their Metaflow flows. The current version is 0.2.1, with relatively frequent updates since its initial release.