Refactor sending of DataRow messages in replication protocol
Some routines open-coded the construction of DataRow messages. Use
TupOutputState struct and associated functions instead, which was
already done in some places.
SendTimeLineHistory() is a bit more complicated and isn't converted by
this.
Reviewed-by: Nathan Bossart <nathandbossart@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/
7e4fdbdc-699c-4cd0-115d-
fb78a957fc22@enterprisedb.com