Move PartitioPruneInfo out of plan nodes into PlannedStmt

The planner will now add a given PartitioPruneInfo to
PlannedStmt.partPruneInfos instead of directly to the
Append/MergeAppend plan node.  What gets set instead in the
latter is an index field which points to the list element
of PlannedStmt.partPruneInfos containing the PartitioPruneInfo
belonging to the plan node.

A later commit will make AcquireExecutorLocks() do the initial
partition pruning to determine a minimal set of partitions to be
locked when validating a plan tree and it will need to consult the
PartitioPruneInfos referenced therein to do so.  It would be better
for the PartitioPruneInfos to be accessible directly than requiring
a walk of the plan tree to find them, which is easier when it can be
done by simply iterating over PlannedStmt.partPruneInfos.

Author: Amit Langote <amitlangote09@gmail.com>
Discussion: https://postgr.es/m/CA+HiwqFGkMSge6TgC9KQzde0ohpAycLQuV7ooitEEpbKB0O_mg@mail.gmail.com

src/include/nodes/pathnodes.h

@@ -122,6 +122,9 @@ typedef struct PlannerGlobal
 	/* "flat" list of AppendRelInfos */
 	List	   *appendRelations;
 
+	/* List of PartitionPruneInfo contained in the plan */
+	List	   *partPruneInfos;
+
 	/* OIDs of relations the plan depends on */
 	List	   *relationOids;
 
@@ -503,6 +506,9 @@ struct PlannerInfo
 
 	/* Does this query modify any partition key columns? */
 	bool		partColsUpdated;
+
+	/* PartitionPruneInfos added in this query's plan. */
+	List	   *partPruneInfos;
 };