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>

tests/models/segformer/test_modeling_segformer.py

@@ -161,6 +161,7 @@ class SegformerModelTest(ModelTesterMixin, unittest.TestCase):
         else ()
     )
 
+    fx_compatible = True
     test_head_masking = False
     test_pruning = False
     test_resize_embeddings = False