Add stubs for untangle (#9402)

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>

stubs/untangle/METADATA.toml

@@ -0,0 +1,4 @@
+version = "1.2.*"
+
+[tool.stubtest]
+ignore_missing_stub = false

stubs/untangle/untangle.pyi

@@ -0,0 +1,37 @@
+from _typeshed import Self
+from collections.abc import Iterator, Mapping
+from typing import Any
+from xml.sax import handler
+
+def is_string(x: object) -> bool: ...
+
+class Element:
+    children: list[Element]
+    is_root: bool
+    cdata: str
+    def __init__(self, name: str | None, attributes: Mapping[str, Any] | None) -> None: ...
+    def add_child(self, element: Element) -> None: ...
+    def add_cdata(self, cdata: str) -> None: ...
+    def get_attribute(self, key: str) -> Any | None: ...
+    def get_elements(self, name: str | None = ...) -> list[Element]: ...
+    def __getitem__(self, key: str) -> Any | None: ...
+    def __getattr__(self, key: str) -> Element: ...
+    def __hasattribute__(self, name: str) -> bool: ...
+    def __iter__(self: Self) -> Iterator[Self]: ...
+    def __bool__(self) -> bool: ...
+    __nonzero__ = __bool__
+    def __eq__(self, val: object) -> bool: ...
+    def __dir__(self) -> list[str]: ...
+    def __len__(self) -> int: ...
+    def __contains__(self, key: str) -> bool: ...
+
+class Handler(handler.ContentHandler):
+    root: Element
+    elements: list[Element]
+    def __init__(self) -> None: ...
+    def startElement(self, name: str, attributes: Mapping[str, Any]) -> None: ...
+    def endElement(self, name: str) -> None: ...
+    def characters(self, cdata: str) -> None: ...
+
+def parse(filename: str, **parser_features: bool) -> Element: ...
+def is_url(string: str) -> bool: ...