[FSDP][optim_state_dict] Let optim_state_dict ignore the non-FSDP managed parameters that do not reside on the rank (#94129)
When FSDP is used with other parallelism (e.g., TorchRec), some parameters that are not managed by FSDP may not reside on all the ranks (TorchRec is model parallelism). When `use_orig_params=True` , FSDP will synchronize the FQNs among ranks. As a result, a rank may get the FQNs that the rank does not actually own. If the FQN belongs to a TorchRec managed parameter, FSDP has to ignore the parameter state. Otherwise FSDP does not know how to store the state.
This PR add the logic to ignore the parameters that are not managed by FSDP and are not on the rank.
Differential Revision: [D42982778](https://our.internmc.facebook.com/intern/diff/D42982778/)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/94129
Approved by: https://github.com/rohan-varma
