[OSS] Add podspec for libtorch-lite (#59638)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/59638
ghstack-source-id: 130847775
Test Plan: .
Reviewed By: husthyc, cccclai
Differential Revision: D28966693
fbshipit-source-id: 1b82623279709d0118c0967e2ba730d5dec040cc
