Foreach kernel codegen in inductor (#99975)
[design doc](https://docs.google.com/document/d/1JLr5yMAR8TuKW78ixKeqzfDHhcazwxKo_JXQnP_-wyY/edit?kh_source=GDOCS#heading=h.8x4z4mmet3im)
Add foreach kernel codegen for a single overload of foreach add in Inductor. Coverage will expand to more ops in subsequent PRs.
[example](https://gist.github.com/mlazos/9606fe64100ea2a5ec8265df1739fbe2)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/99975
Approved by: https://github.com/jansel
