Add json-columns module: JSON columns in Hibernate 7.4.14 (@JdbcTypeCode(SqlTypes.JSON)), JSONB querying, GIN/expression indexes, dirty checking, Jackson 3 vs 2 on PostgreSQL 18.6 and MySQL 8.0.46

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_017ic4b6Kg9RWSTJzyz6KP9X

json-columns/src/test/java/com/ankurm/jsoncolumns/SqlLog.java

@@ -0,0 +1,17 @@
+package com.ankurm.jsoncolumns;
+
+import java.util.List;
+import java.util.concurrent.CopyOnWriteArrayList;
+import org.hibernate.resource.jdbc.spi.StatementInspector;
+
+/** Hibernate statement inspector that records every SQL string. Registered by {@link Db} via a Hibernate property. */
+public class SqlLog implements StatementInspector {
+    private static final List<String> LOG = new CopyOnWriteArrayList<>();
+
+    @Override
+    public String inspect(String sql) { LOG.add(sql); return sql; }
+
+    public static void clear() { LOG.clear(); }
+
+    public static List<String> take() { List<String> copy = List.copyOf(LOG); LOG.clear(); return copy; }
+}