Multi GPU Support

[mattjhawken]

We need to implement multi-GPU support for systems with 2 or more GPUs connected via x16 PCI-E lanes.

• we can leverage device_map="auto" to automatically shard models for HuggingFace models
• Utilize torch.distributed or torch.nn.parallel.DistributedDataParallel for efficient parallelism

Extend torch_node to track multi-device configurations, and ensure this device metadata is broadcast across the P2P network for smarter job routing and coordination.