Revert "[aot_inductor] move CudaWrapperCodeGen into a separate file (#119448)"
This reverts commit 0597dab523c0a341e136452a8f723f12700164c0.
Reverted https://github.com/pytorch/pytorch/pull/119448 on behalf of https://github.com/DanilBaibak due to Broken trunk ([comment](https://github.com/pytorch/pytorch/pull/119448#issuecomment-1937345167))
