[AOTI][refactor] Update tensor_converter util functions (#121743)
Summary: Update the signature of unsafe_alloc_new_handles_from_tensors and alloc_tensors_by_stealing_from_handles. This is a preparation step towards adding pybind for these two functions, which will be used by cpp_wraper JIT Inductor.
Differential Revision: [D54818717](https://our.internmc.facebook.com/intern/diff/D54818717)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/121743
Approved by: https://github.com/chenyang78
ghstack dependencies: #121523
