Add unit property to Timedelta

Author: skatsuta

pandas-stubs/_libs/tslibs/timedeltas.pyi

@@ -390,3 +390,5 @@ class Timedelta(timedelta):
     @property
     def components(self) -> Components: ...
     def view(self, dtype: npt.DTypeLike = ...) -> object: ...
+    @property
+    def unit(self) -> str: ...

tests/test_scalars.py

@@ -517,6 +517,7 @@ def test_timedelta_properties_methods() -> None:
     check(assert_type(td.value, int), int)
     check(assert_type(td.resolution_string, str), str)
     check(assert_type(td.components, Components), Components)
+    check(assert_type(td.unit, str), str)
 
     check(assert_type(td.ceil("D"), pd.Timedelta), pd.Timedelta)
     check(assert_type(td.floor(Day()), pd.Timedelta), pd.Timedelta)