Add Morphology nodes from kornia (#2781)

* import kornia

* Added morphology nodexs

* Add kornia to requirements

* fix choices

* options, also move to postprocessors

* fix placing and step

nodes.py

@@ -1960,6 +1960,7 @@ def init_custom_nodes():
         "nodes_sdupscale.py",
         "nodes_photomaker.py",
         "nodes_cond.py",
+        "nodes_morphology.py",
         "nodes_stable_cascade.py",
         "nodes_differential_diffusion.py",
     ]