Import alignment from csv (#6234)

* Start of the official alignment API

* Import alignment into bonsai model using CSV file

src/ifcopenshell-python/ifcopenshell/api/alignment/get_parent_alignment.py

@@ -0,0 +1,45 @@
+# IfcOpenShell - IFC toolkit and geometry engine
+# Copyright (C) 2025 Thomas Krijnen <thomas@aecgeeks.com>
+#
+# This file is part of IfcOpenShell.
+#
+# IfcOpenShell is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# IfcOpenShell is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with IfcOpenShell.  If not, see <http://www.gnu.org/licenses/>.
+
+import ifcopenshell
+import ifcopenshell.util
+from ifcopenshell import entity_instance
+from typing import Sequence
+
+import ifcopenshell.util.representation
+
+
+def get_parent_alignment(alignment: entity_instance) -> entity_instance:
+    """
+    Returns the parent alignment. When multiple vertical alignments share a horizontal alignment
+    the horizontal alignment is nested to the parent alignment, a child alignment is aggregated
+    to the parent alignment for each vertical alignment, and the vertical alignment is nested with
+    its child alignment.
+
+    Example:
+
+    .. code:: python
+        alignment = model.by_type("IfcAlignment")[0]
+        parent = ifcopenshell.api.alignment.get_parent_alignment(alignment)
+    """
+
+    for rel in alignment.Decomposes:
+        if rel.RelatingObject.is_a("IfcAlignment"):
+            return rel.RelatingObject
+
+    return None