[LT] Sync with the lazy_tensor_staging branch (#69527)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/69527
- Add missing TORCH_API in class/struct declarations;
- Fix internal op declarations in ltc_ops;
- Update lazy_ts_lowering.py
Test Plan: Imported from OSS
Reviewed By: alanwaketan
Differential Revision: D32918929
Pulled By: desertfire
fbshipit-source-id: e956d51aff5ef593fdf4cd5ad2a38e38788913d8
