Update base for Update on "make aoti_torch_empty_strided support creating incontiguous tensor"

This diff modifies the `aoti_torch_empty_strided` function to support the creation of incontiguous tensors.

To achieve it, this diff:
1. update the way to calculate the memory size by using both tensor size and the stride
2. skip stride check in ETensor by adding and checking cmake macro `USE_CUDA_BACKEND` when building with CUDA backend support.

we will soon bring the ETensor check back for every backend after migrating to use slimtensor.

Differential Revision: [D84938258](https://our.internmc.facebook.com/intern/diff/D84938258/)

[ghstack-poisoned]

Author: Gasoonjia