[I] [R] Let `na.rm` of `mean()` support `NaN` as base R [arrow]

[via GitHub]

psychelzh opened a new issue, #44089:
URL: https://github.com/apache/arrow/issues/44089

   ### Describe the enhancement requested
   
   See the following example:
   
   ``` r
   suppressPackageStartupMessages(library(dplyr))
   data.frame(x = c(1, 2, NaN)) |> 
     arrow::as_arrow_table() |>
     summarise(x_avg = mean(x, na.rm = TRUE)) |> 
     collect()
   #> # A tibble: 1 × 1
   #>   x_avg
   #>   <dbl>
   #> 1   NaN
   ```
   
   ``` r
   data.frame(x = c(1, 2, NaN)) |> 
     summarise(x_avg = mean(x, na.rm = TRUE))
   #>   x_avg
   #> 1   1.5
   ```
   
   <sup>Created on 2024-09-12 with [reprex 
v2.1.0](https://reprex.tidyverse.org)</sup>
   
   
   
   ### Component(s)
   
   R


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