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 <[email protected]>
Discussion: 
https://www.postgresql.org/message-id/flat/[email protected]

Branch
------
master

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

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

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