REF: implement nanops.na_accum_func
this is a follow-up that was requested a few months ago
@TomAugspurger thoughts on whether we're going to do a 1.0.3?  if so i should hold off on refactors like this I'm not sure if we're doing a 1.0.3. Will talk about it on the call today.

On Tue, Mar 10, 2020 at 9:46 PM Jeff Reback <notifications@github.com>
wrote:

> *@jreback* commented on this pull request.
>
> @TomAugspurger <https://github.com/TomAugspurger> thoughts on whether
> we're going to do a 1.0.3? if so i should hold off on refactors like this
>
> this is for 1.1 right?
> ------------------------------
>
> In pandas/core/nanops.py
> <https://github.com/pandas-dev/pandas/pull/32597#discussion_r390718006>:
>
> > @@ -1497,3 +1497,62 @@ def nanpercentile(
>              return result
>      else:
>          return np.percentile(values, q, axis=axis, interpolation=interpolation)
> +
> +
> +def na_accum_func(values, accum_func, skipna: bool):
>
> can you add a doc-string
>
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 thanks