message: Add Java constant for default schema name
diff: @@ -8,6 +8,9 @@ import java.util.concurrent.atomic.AtomicInteger;
  public class DuckDBDatabase {
  + /** Name of the DuckDB default schema. */
  + public static final String DEFAULT_SCHEMA = "main";
  +
  protected String url;
  protected boolean read_only;
  private AtomicInteger connections;
  