Allow reversed to take any object implementing __len__ and __getitem__ (#5820)

`reversed` is currently annotated as accepting either a `Sequence` or objects implementing the `__reversed__` protocol.
This however is too strict as, per its [docs](https://docs.python.org/3/library/functions.html#reversed), it can take any object that implements `__len__` and `__getitem__`.

stubs/annoy/annoy/__init__.pyi

@@ -1,8 +1,8 @@
-from typing import Sized, overload
-from typing_extensions import Literal, Protocol
+from _typeshed import SupportsLenAndGetItem
+from typing import overload
+from typing_extensions import Literal
 
-class _Vector(Protocol, Sized):
-    def __getitem__(self, i: int) -> float: ...
+_Vector = SupportsLenAndGetItem[float]
 
 class AnnoyIndex:
     f: int