Add upgrader related logic to flatbuffer (#71451)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/71451
title
Test Plan: unittest
Reviewed By: tugsbayasgalan
Differential Revision: D33593056
fbshipit-source-id: c48d6ad50e6e2f757b68525dfe07693711b95840
(cherry picked from commit 8e09e20c1dafcdbdb45c2d1574da68a32e54a3a5)
