Revert "[aot_inductor] move CppWrapperCodeGen into a separate file (#119491)"
This reverts commit 760056bbdc552314e7e81adc45e11766ac0f333c.
Reverted https://github.com/pytorch/pytorch/pull/119491 on behalf of https://github.com/DanilBaibak due to Reverted as a dependency for #119448 ([comment](https://github.com/pytorch/pytorch/pull/119491#issuecomment-1937344548))
