[PyTorch][ET] Collect Process Groups Mapping Info (#104373)
Summary: Add the logics and interface to log ProcessGroup comms configuration (unique ID, type, and ranks info).
Test Plan:
Testing in HPC:
```
TORCH_LOGS=all ../buck-out/v2/gen/fbcode/c8344b52091f4f7f/hpc/models/ads/__ads_10x_launcher__/ads_10x_launcher.par +launcher=local launcher.num_trainers=4 +data_loader=random data_loader.num_batches=2000
```
Example output in ET:
```
{
"name": "## process_group:init ##", "id": 3, "rf_id": 1, "parent": 2, "fw_parent": 0, "seq_id": -1, "scope": 7, "tid": 1, "fw_tid": 0, "op_schema": "",
"inputs": ["[{'pg_id': 140538064364672, 'backend_id': 140538060772480, 'backend_config': 'cuda:nccl', 'ranks': {0: 0, 1: 1, 2: 2, 3: 3}}, {'pg_id': 140538064363904, 'backend_id': 140538042628864, 'backend_config': 'cuda:nccl', 'ranks': {0: 0, 1: 1, 2: 2, 3: 3}}]"], "input_shapes": [[]], "input_types": ["String"],
"outputs": [], "output_shapes": [], "output_types": []
},
```
Differential Revision: D46321690
Pull Request resolved: https://github.com/pytorch/pytorch/pull/104373
Approved by: https://github.com/kwen2501
