[#3702] Add Configuration.family() for convenience and API consistency

jOOQ/src/main/java/org/jooq/Configuration.java

@@ -227,6 +227,11 @@ public interface Configuration extends Serializable {
      */
     SQLDialect dialect();
 
+    /**
+     * Retrieve the family of the configured dialect.
+     */
+    SQLDialect family();
+
     /**
      * Retrieve the runtime configuration settings.
      */

jOOQ/src/main/java/org/jooq/impl/DefaultConfiguration.java

@@ -717,6 +717,14 @@ public class DefaultConfiguration implements Configuration {
         return dialect;
     }
 
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public final SQLDialect family() {
+        return dialect.family();
+    }
+
     /**
      * {@inheritDoc}
      */