Add missing definitions for urllib/response.pyi (#4118)

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>

stdlib/3/urllib/response.pyi

@@ -1,12 +1,14 @@
 # private module, we only expose what's needed
 
-from typing import BinaryIO, Iterable, List, Mapping, Optional, Type, TypeVar
+from typing import Any, BinaryIO, Callable, IO, Iterable, List, Mapping, Optional, Tuple, Type, TypeVar
 from email.message import Message
 from types import TracebackType
 
 _AIUT = TypeVar("_AIUT", bound=addbase)
 
 class addbase(BinaryIO):
+    fp: IO[bytes]
+    def __init__(self, fp: IO[bytes]) -> None: ...
     def __enter__(self: _AIUT) -> _AIUT: ...
     def __exit__(self, type: Optional[Type[BaseException]], value: Optional[BaseException], traceback: Optional[TracebackType]) -> None: ...
     def __iter__(self: _AIUT) -> _AIUT: ...
@@ -31,12 +33,19 @@ class addbase(BinaryIO):
     def write(self, s: bytes) -> int: ...
     def writelines(self, lines: Iterable[bytes]) -> None: ...
 
+class addclosehook(addbase):
+    closehook: Callable[..., object]
+    hookargs: Tuple[Any, ...]
+    def __init__(self, fp: IO[bytes], closehook: Callable[..., object], *hookargs: Any) -> None: ...
+
 class addinfo(addbase):
     headers: Message
+    def __init__(self, fp: IO[bytes], headers: Message) -> None: ...
     def info(self) -> Message: ...
 
 class addinfourl(addinfo):
     url: str
     code: int
+    def __init__(self, fp: IO[bytes], headers: Message, url: str, code: Optional[int] = ...) -> None: ...
     def geturl(self) -> str: ...
     def getcode(self) -> int: ...