[SPMD] Introduce graph_optimization_pass and comm_fusion_with_cat (#98285)
This PR add `graph_optimization_pass` decorator which should be wrapped by all graph optimization passes. This PR also introduces the first graph optimization, `comm_fusion_with_cat`, as the first use case of `graph_optimization_pass`.
Differential Revision: [D44661608](https://our.internmc.facebook.com/intern/diff/D44661608/)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/98285
Approved by: https://github.com/yifuwang
