Add native support for Arrow objects in span_range

## Issue Description
The span_range function typehint the start and end as datetime objects.

` def span_range(
cls,
frame: _T_FRAMES,
start: dt_datetime,
end: dt_datetime,
tz: Optional[TZ_EXPR] = None,
limit: Optional[int] = None,
bounds: _BOUNDS = "[)",
exact: bool = False,
) -> Iterable[Tuple["Arrow", "Arrow"]]`

It's will happily work with Arrow objects.

This works because the `fromdatetime` function will take an Arrow object and convert it again to an Arrow object.

I believe the correct usage it to natively support Arrow objects as input without explicitly converting an Arrow object to datetime just to be converted again internally.

Locate the span_range function and inspect how its start and end arguments are typed and passed to fromdatetime. Confirm the current Arrow-object behavior and identify the expected native-input path; done means Arrow objects are accepted directly without an unnecessary datetime conversion and the relevant behavior is covered by tests.

Written by the indexing model from the issue text.