Refactor to usecase as asked in #1881 (#1907)

src/ifcopenshell-python/ifcopenshell/api/boundary/edit_attributes.py

@@ -0,0 +1,19 @@
+class Usecase:
+    def __init__(self, file, **kwargs):
+        """location, axis and ref_direction defines the plane"""
+        self.file = file
+        self.entity: "IfcRelSpaceBoundary"
+        self.relating_space: "IfcSpace | IfcExternalSpatialElement"
+        self.related_building_element: "IfcElement"
+        self.parent_boundary: "IfcRelSpaceBoundary" = None
+        self.corresponding_boundary: "IfcRelSpaceBoundary" = None
+        for key, value in kwargs.items():
+            setattr(self, key, value)
+
+    def execute(self):
+        self.entity.RelatingSpace = self.relating_space
+        self.entity.RelatedBuildingElement = self.related_building_element
+        if hasattr(self.entity, "ParentBoundary"):
+            self.entity.ParentBoundary = self.parent_boundary
+        if hasattr(self.entity, "CorrespondingBoundary"):
+            self.entity.CorrespondingBoundary = self.corresponding_boundary