New ifcopenshell.api.run syntax, and rename create_product to create_entity. See #1399.

src/ifcopenshell-python/ifcopenshell/api/__init__.py

@@ -0,0 +1,11 @@
+import importlib
+import ifcopenshell.api
+
+
+def run(usecase_path, ifc_file=None, **settings):
+    importlib.import_module(f"ifcopenshell.api.{usecase_path}")
+    module, usecase = usecase_path.split(".")
+    usecase_class = getattr(getattr(getattr(ifcopenshell.api, module), usecase), "Usecase")
+    if ifc_file:
+        return usecase_class(ifc_file, **settings).execute()
+    return usecase_class(**settings).execute()