UI: Add Vertex Crease operator to vertex context menu

Add Vertex Crease operator to vertex context menu. This is consistent with
edge context menu having Edge Crease menu.

Pull Request: https://projects.blender.org/blender/blender/pulls/109146

scripts/startup/bl_ui/space_view3d.py

@@ -4307,6 +4307,10 @@ class VIEW3D_MT_edit_mesh_context_menu(Menu):
             col.menu("VIEW3D_MT_mirror", text="Mirror Vertices")
             col.menu("VIEW3D_MT_snap", text="Snap Vertices")
 
+            col.separator()
+            
+            col.operator("transform.vert_crease")
+            
             col.separator()
 
             # Removal Operators