pgsql: Refactor sending of DataRow messages in replication protocol

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

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/16d52fc89dbe8394ed318521e076f08fd2e4bf8c

Modified Files
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src/backend/access/common/printsimple.c   | 11 +++++
src/backend/replication/basebackup_copy.c | 69 ++++++++++---------------------
2 files changed, 33 insertions(+), 47 deletions(-)