Xread last entry in stream (#7388) (#13117)
Allow using `+` as a special ID for last item in stream on XREAD
command.
This would allow to iterate on a stream with XREAD starting with the
last available message instead of the next one which `$` is used for.
I.e. the caller can use `BLOCK` and `+` on the first call, and change to
`$` on the next call.
Closes #7388
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Co-authored-by:
Felipe Machado <462154+felipou@users.noreply.github.com>
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