[FSDP] ufmt /fsdp (#87811)
This applies `ufmt` to all of the FSDP files in the `torch/distributed/fsdp/` directory.
**Test Plan**
CI
**Notes**
For VSCode users,
- Install `ufmt`: https://pypi.org/project/ufmt/
- Install VSCode `ufmt` extension: https://marketplace.visualstudio.com/items?itemName=omnilib.ufmt
- Include in `settings.json`:
```
{
"[python]": {
"editor.defaultFormatter": "omnilib.ufmt",
"editor.formatOnSave": true,
},
}
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/87811
Approved by: https://github.com/rohan-varma, https://github.com/fegin
