Function polars_arrow::kernels::rolling::nulls::rolling_mean

pub fn rolling_mean<T>(
    arr: &PrimitiveArray<T>, 
    window_size: usize, 
    min_periods: usize, 
    center: bool, 
    weights: Option<&[f64]>
) -> ArrayRef where
    T: NativeType + Sum + Zero + AddAssign + Copy + Float,