Generate functions for all API usecases for better static code features. See #2693.

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

@@ -15,3 +15,13 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with IfcOpenShell.  If not, see <http://www.gnu.org/licenses/>.
+
+from .add_metric import add_metric
+from .add_metric_reference import add_metric_reference
+from .add_objective import add_objective
+from .assign_constraint import assign_constraint
+from .edit_metric import edit_metric
+from .edit_objective import edit_objective
+from .remove_constraint import remove_constraint
+from .remove_metric import remove_metric
+from .unassign_constraint import unassign_constraint