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

src/include/nodes/parsenodes.h

@@ -355,7 +355,7 @@ union ValUnion
 
 typedef struct A_Const
 {
-	pg_node_attr(custom_copy_equal, custom_read_write)
+	pg_node_attr(custom_copy_equal, custom_read_write, custom_query_jumble)
 
 	NodeTag		type;
 	union ValUnion val;