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

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

@@ -15,3 +15,8 @@
 #
 # 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 .append_asset import append_asset
+from .assign_declaration import assign_declaration
+from .create_file import create_file
+from .unassign_declaration import unassign_declaration