Add missing __hash__ stubs (#746)

Author: TheTripleV

pandas-stubs/_libs/tslibs/timedeltas.pyi

@@ -386,6 +386,7 @@ class Timedelta(timedelta):
     ) -> npt.NDArray[np.bool_]: ...
     @overload
     def __gt__(self, other: TimedeltaSeries | Series[pd.Timedelta]) -> Series[bool]: ...
+    def __hash__(self) -> int: ...
     def isoformat(self) -> str: ...
     def to_numpy(self) -> np.timedelta64: ...
     @property

pandas-stubs/_libs/tslibs/timestamps.pyi

@@ -231,6 +231,7 @@ class Timestamp(datetime):
     def __ne__(self, other: npt.NDArray[np.datetime64] | Index) -> np_ndarray_bool: ...  # type: ignore[misc]
     @overload
     def __ne__(self, other: object) -> Literal[True]: ...
+    def __hash__(self) -> int: ...
     def weekday(self) -> int: ...
     def isoweekday(self) -> int: ...
     def isocalendar(self) -> _IsoCalendarDate: ...