pgsql: Apply some query jumbling to WAIT FOR LSN

Apply some query jumbling to WAIT FOR LSN

The query is now stored as normalized in pg_stat_statements, with its
LSN position ignored in the jumbling, resulting in:
WAIT FOR LSN $1;

The option values in the WITH clause are left untouched.

Reported-by: Peter Eisentraut <peter(at)eisentraut(dot)org>
Author: Sirisha Chamarthi <sirichamarthi22(at)gmail(dot)com>
Reviewed-by: Sami Imseih <samimseih(dot)pg(at)gmail(dot)com>
Reviewed-by: Rithvika Devisetti <devisettirithvika(at)gmail(dot)com>
Discussion: https://postgr.es/m/1f04f78c-2cfa-47a0-997f-f02572cd10eb@eisentraut.org
Backpatch-through: 19

Branch
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REL_19_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/7635a3206797a9c793bcf2e43d107c9fe08dc17d

Modified Files
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contrib/pg_stat_statements/expected/utility.out | 41 +++++++++++++++++++++++++
contrib/pg_stat_statements/sql/utility.sql | 10 ++++++
src/backend/parser/gram.y | 1 +
src/include/nodes/parsenodes.h | 8 +++--
4 files changed, 58 insertions(+), 2 deletions(-)