pgsql: Include values of A_Const nodes in query jumbling

Include values of A_Const nodes in query jumbling

Like the implementation for node copy, write and read, this node
requires a custom implementation so as the query jumbling is able to
consider the correct value assigned to it, depending on its type (int,
float, bool, string, bitstring).

Based on a dump of pg_stat_statements from the regression database, this
would confuse the query jumbling of the following queries:
- SET.
- COPY TO with SELECT queries.
- START TRANSACTION with different isolation levels.
- ALTER TABLE with default expressions.
- CREATE TABLE with partition bounds.

Note that there may be a long-term argument in tracking the location of
such nodes so as query strings holding such nodes could be normalized,
but this is left as a separate discussion.

Oversight in 3db72eb.

Discussion: https://postgr.es/m/Y9+HuYslMAP6yyPb@paquier.xyz

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/9ba37b2cb6a174b37fc51d0649ef73e56eae27fc

Modified Files
--------------
.../expected/pg_stat_statements.out | 16 +++++++++-
.../pg_stat_statements/sql/pg_stat_statements.sql | 8 +++++
src/backend/nodes/queryjumblefuncs.c | 35 ++++++++++++++++++++++
src/include/nodes/parsenodes.h | 2 +-
4 files changed, 59 insertions(+), 2 deletions(-)