[vulkan] Move Tensor.* from `ops/` folder to `api/` folder (#91033)
Moves `Tensor.h` and `Tensor.cpp` from the `ops/` folder to the `api/` folder.
Differential Revision: [D42106179](https://our.internmc.facebook.com/intern/diff/D42106179/)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/91033
Approved by: https://github.com/kirklandsign
