PG17 compatibilty: Fix ERROR: unrecognized aclright: 16384

Fix `ERROR: unrecognized aclright: 16384`, observed in several tests
(generated_identity, create_single_shard_table, grant_on_sequence_propagation,
grant_on_foreign_server_propagation, single_node_enterprise,
multi_multiuser_master_protocol, multi_alter_table_row_level_security,
shard_move_constraints)

The fix requires updating function `convert_aclright_to_string` in citus_ruleutils.c
to include ACL_MAINTAIN, added the introuduction of MAINTAIN privelege in PG17:
https://git.postgresql.org/gitweb/?p=postgresql.git;a=commitdiff;h=ecb0fd337

Also update `convert_aclright_to_string` to include ACL_SET and
ACL_ALTER_SYSTEM, added by this PG17 commit:
postgres/postgres@a0ffa885e

This keeps `convert_aclright_to_string()` in citus_ruleutils.c
consistent with our currently supported Postgres versions.

src/backend/distributed/deparser/citus_ruleutils.c

@@ -1359,6 +1359,17 @@ convert_aclright_to_string(int aclright)
 			return "TEMPORARY";
 		case ACL_CONNECT:
 			return "CONNECT";
+#if PG_VERSION_NUM >= PG_VERSION_15
+		case ACL_SET:
+			return "SET";
+		case ACL_ALTER_SYSTEM:
+			return "ALTER SYSTEM";
+#endif
+
+#if PG_VERSION_NUM >= PG_VERSION_17
+		case ACL_MAINTAIN:
+			return "MAINTAIN";
+#endif
 		default:
 			elog(ERROR, "unrecognized aclright: %d", aclright);
 			return NULL;