[AT-VK][EZ] Move ops to dedicated folder (#120364)
These ops are at the level of the OperatorRegistry from the previous change. All ExecuTorch ops will go here.
```
ATen/native/vulkan/graph/ops
```
They are not to be confused with the general ATen ops from `native_functions.yaml` that will continue to exist. All PyTorch ops are here.
```
ATen/native/vulkan/ops
```
To help think around this split, note that we can actually implement the latter ATen ops with the former OperatorRegistry ops, since it's currently a subset.
Differential Revision: [D54030933](https://our.internmc.facebook.com/intern/diff/D54030933/)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/120364
Approved by: https://github.com/SS-JIA
ghstack dependencies: #120362, #120363
