Flush Memoize cache when non-key parameters change, take 2

It's possible that a subplan below a Memoize node contains a parameter
from above the Memoize node.  If this parameter changes then cache entries
may become out-dated due to the new parameter value.

Previously Memoize was mistakenly not aware of this.  We fix this here by
flushing the cache whenever a parameter that's not part of the cache
key changes.

Bug: #17213
Reported by: Elvis Pranskevichus
Author: David Rowley
Discussion: https://postgr.es/m/17213-988ed34b225a2862@postgresql.org
Backpatch-through: 14, where Memoize was added

src/backend/nodes/readfuncs.c

@@ -2232,6 +2232,7 @@ _readMemoize(void)
 	READ_BOOL_FIELD(singlerow);
 	READ_BOOL_FIELD(binary_mode);
 	READ_UINT_FIELD(est_entries);
+	READ_BITMAPSET_FIELD(keyparamids);
 
 	READ_DONE();
 }