[fx2trt] Add trt splitter setting (#71717)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/71717
Add a setting class for trt splitter which has a specific setting `use_implicit_batch_dim`. Further diffs will try to merge `fx2trt/split.py` and trt splitter.
Test Plan: CI
Reviewed By: wushirong
Differential Revision: D33745251
fbshipit-source-id: 5192da9c9b69d86839a8f26636852d405a40cfe7
(cherry picked from commit e2b0ccb1fab82eb54145404f7fce82294693f9a4)
