Add limited FSDP correctness to torchdynamo benchmark (#89469)
- Does not do recursive wrapping
- Only supports accuracy bench
- Mainly useful for sweeping over models for correctness, in part
to evaluate whether dynamo support for FSDP is breaking anywhere
Pull Request resolved: https://github.com/pytorch/pytorch/pull/89469
Approved by: https://github.com/davidberard98, https://github.com/aazzolini
