Add type hints

src/xmlsec/__init__.pyi

@@ -13,6 +13,8 @@ from xmlsec.constants import __Transform as Transform
 _E = TypeVar('_E', bound=_Element)
 
 def enable_debug_trace(enabled: bool = ...) -> None: ...
+def get_libxml_version() -> tuple[int, int, int]: ...
+def get_libxml_compiled_version() -> tuple[int, int, int]: ...
 def init() -> None: ...
 def shutdown() -> None: ...
 def cleanup_callbacks() -> None: ...