[MPS] Add `torch.fft.` support (#119670)
Increase tolerance for `ftt` ops, that warrants a further investigation as it grows larger with larger matrix dimensions (see https://github.com/pytorch/pytorch/issues/120237 )
When compiling on MacOS13, implement `+[FakeMPSGraphFFTDescriptor descriptor]` as a redispatch to a real thing.
Fixes https://github.com/pytorch/pytorch/issues/78044
Pull Request resolved: https://github.com/pytorch/pytorch/pull/119670
Approved by: https://github.com/kulinseth, https://github.com/albanD
