VAI: Replace namespace+name default sort with id (#724)

* Sort by ID rather than metadata.namespace,metadata.name

- In tests add an id field to the list of fields to cache/create and to the objects.

* Add benchmark tests to compare sorting by ns/name vs id.

pkg/sqlcache/informer/listoption_indexer.go

@@ -794,7 +794,8 @@ func (l *ListOptionIndexer) constructQuery(lo *sqltypes.ListOptions, partitions
 	} else {
 		// make sure one default order is always picked
 		if l.namespaced {
-			query += "\n  ORDER BY f.\"metadata.namespace\" ASC, f.\"metadata.name\" ASC "
+			// ID == metadata.namespace + "/" + metaqata.name
+			query += "\n  ORDER BY f.\"id\" ASC "
 		} else {
 			query += "\n  ORDER BY f.\"metadata.name\" ASC "
 		}