fix: Allow duplicate sub-assemblies

Author: nathaniel-brough

box.brep

@@ -0,0 +1,282 @@
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cadquery/assembly.py

@@ -244,9 +244,8 @@ def add(self, arg, **kwargs):
             # enforce unique names
             name = kwargs["name"] if kwargs.get("name") else arg.name
             if name in self.objects:
-                raise ValueError(
-                    f"Unique name is required. {name} is already in the assembly"
-                )
+                # Add a incremented number to the name
+                name = f"{name}_{len(self.objects)}"
 
             subassy = arg._copy()