Preserve node meta info in split_module (#56212)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/56212
The current design doesn't make it easy to use `node.copy()`. Explicitly copy over the node's meta.
Test Plan: Updated `test_subgraph_creation` in `test_fx_experimental`
Reviewed By: jamesr66a
Differential Revision: D27808477
fbshipit-source-id: 7fe7b6428c830307dbd1e395f16fa2774936d3b3
