[Chapel Merge] Deprecate both ItemReader and ItemWriter

Branch: refs/heads/main
Revision: de731b7
Author: benharsh
Link: Unavailable
Log Message:

Merge pull request #19896 from benharsh/deprecate-item-reader

Deprecate both ItemReader and ItemWriter

After discussion on #19829 this merge will deprecate the ItemReader/Writer types and their methods without no-doc-ing anything.

[reviewed-by @lydia-duncan]

Modified Files:
A test/deprecated/IO/itemReader.chpl

A test/deprecated/IO/itemReader.good
M modules/standard/IO.chpl
M test/deprecated/IO/itemWriter.chpl
M test/deprecated/IO/itemWriter.good
M test/io/ferguson/io_test.good

Compare: https://github.com/chapel-lang/chapel/compare/92a56145f7e6...de731b762ac7