[dtensor][debug] have visualize_sharding correctly print for sub-mesh DTensor (#121216)
**Summary**
In `visualize_sharding` we chose to only print on rank 0 (global rank) which means calling `visualize_sharind` will never print anything when the dtensor object's mesh doesn't include rank 0 (i.e. a sub-mesh). This PR has `visualize_sharding` always print on rank whose mesh coordinate is (0, 0, ..., 0) instead of whose global rank is 0.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/121216
Approved by: https://github.com/wanchaol
ghstack dependencies: #121179, #120260
