Support segformer fx (#19924)
* Support segformer fx
* Add fx_compatible attribute to test_modeling_segformer.py
* Update glpn model (fx support)
glpn model was copied from segformer.
* Update utils/fx.py | add semantic-segmentation
for SegformerForSemanticSegmentation model
* Fix minor import order(isort)
* Add random input generation for segformer fx
Co-authored-by: noelbird <lduldu00228@gmail.com>
