Add an import statement for a class referenced by the Javadoc @link tag (#1247)

Author: nakamura-to

doma-core/src/main/java/org/seasar/doma/jdbc/criteria/QueryDsl.java

@@ -5,6 +5,7 @@
 import java.util.Optional;
 import java.util.function.Consumer;
 import org.seasar.doma.jdbc.Config;
+import org.seasar.doma.jdbc.ConfigProvider;
 import org.seasar.doma.jdbc.criteria.context.DeleteSettings;
 import org.seasar.doma.jdbc.criteria.context.InsertSettings;
 import org.seasar.doma.jdbc.criteria.context.SelectContext;