[fx2trt][easy] add sparse flag to TRTInterpreter (#69495)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/69495
As the title. Separated from D30589161.
Test Plan: Tested in D30589161.
Reviewed By: maratsubkhankulov, wushirong
Differential Revision: D32898927
fbshipit-source-id: 89e18d2eb19b43fbab92b4988d0a21d21cff2d1f
