feat: support sql ORDER BY

Summary

• feat: support sql ORDER BY

• Close sbroad#151 (closed)
• Target branch: master
• Changes should be cherry-picked to 24.2: no
• Docs follow-up: docs#241 (closed)

src/sql/pgproto.rs

@@ -675,6 +675,7 @@ impl TryFrom<&Node> for CommandTag {
                 | Relational::ScanSubQuery { .. }
                 | Relational::Selection { .. }
                 | Relational::GroupBy { .. }
+                | Relational::OrderBy { .. }
                 | Relational::Having { .. }
                 | Relational::UnionAll { .. }
                 | Relational::Values { .. }