[AOTI][refactor] Split common aoti_runtime utils into a separate header (#119066)
Summary: Split common utils from aoti_runtime/model.h into a separate header file, because when turning on ABI-compatible mode for JIT Inductor we won't need AOTInductorModel, but we do need some common utils, e.g. RAIIAtenTensorHandle.
Differential Revision: [D53478809](https://our.internmc.facebook.com/intern/diff/D53478809)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/119066
Approved by: https://github.com/khabinov
