[v23.3.x] Add forward iterator to async_for_each #16688
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async_for_each originally assumed random access iterators, but we can also support forward iterators at the cost of some complexity. The main limitation with forward iterators is that we cannot do arithmetic on the iterators to determine the size of the range and to pre-calculate end iterators. So we use counted loops instead when those iterators are used (we dispatch to a separate path for random access iterators). (cherry picked from commit c667749)
This was referenced Mar 13, 2024
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Backport of PR #16676