Raise a WARNING for max_slot_wal_keep_size in pg_createsubscriber.

During the pg_createsubscriber execution, it is possible that the required
WAL is removed from the primary/publisher node due to
'max_slot_wal_keep_size'.

This patch raises a WARNING during the '--dry-run' mode if the
'max_slot_wal_keep_size' is set to a non-default value on the
primary/publisher node.

Author: Shubham Khanna <khannashubham1...@gmail.com>
Reviewed-by: Peter Smith <smithpb2...@gmail.com>
Reviewed-by: Hayato Kuroda <kuroda.hay...@fujitsu.com>
Reviewed-by: Vignesh C <vignes...@gmail.com>
Discussion: 
https://postgr.es/m/CAHv8Rj+deqsQXOMa7Tck8CBQUbsua=+4AuMVQ2=mpm0f-zh...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/217919dd0954f54402e8d0a38cd203a740754077

Modified Files
--------------
doc/src/sgml/ref/pg_createsubscriber.sgml   |  7 +++++++
src/bin/pg_basebackup/pg_createsubscriber.c | 20 +++++++++++++++++++-
2 files changed, 26 insertions(+), 1 deletion(-)

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