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

backends/cuda/runtime/shims/memory.cpp

@@ -234,10 +234,9 @@ AOTITorchError aoti_torch_empty_strided(
     }
     // For each dimension, add stride[i] * (size[i] - 1)
     // This gives us the maximum offset in that dimension
-    int64_t stride_i = (strides_ptr != nullptr) ? strides_ptr[i] : 0;
+    int64_t stride_i = (strides_ptr != nullptr) ? strides_ptr[i] : 1;
     if (strides_ptr == nullptr) {
       // Calculate contiguous stride if not provided
-      stride_i = 1;
       for (int64_t j = i + 1; j < ndim; j++) {
         stride_i *= sizes_ptr[j];
       }