[R] inject base class for Array, ChunkedArray and Scalar

[asfimport]

Related to comment #8256 (comment)

There's a bunch of these :

#' @export
sum.Array <- function(..., na.rm = FALSE) scalar_aggregate("sum", ..., na.rm = na.rm)

#' @export
sum.ChunkedArray <- sum.Array

#' @export
sum.Scalar <- sum.Array

and having a empty base class between these and ArrowObject would help, we would only have one function and let S3 do its thing

Reporter: Romain Francois / @romainfrancois
Assignee: Neal Richardson / @nealrichardson

PRs and other links:

• GitHub Pull Request #9345

_{Note: This issue was originally created as ARROW-10089. Please see the migration documentation for further details.}

[asfimport]

Neal Richardson / @nealrichardson:
Issue resolved by pull request 9345
#9345