Add ObjectStringMapBuilder

Convenient builder for DSL `getComponentsToRegister()`.

spring-integration-core/src/main/java/org/springframework/integration/support/ObjectStringMapBuilder.java

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.integration.support;
+
+/**
+ * A map builder creating a map with Object keys and String values.
+ * @author Gary Russell
+ * @since 5.0.2
+ *
+ */
+public class ObjectStringMapBuilder extends MapBuilder<ObjectStringMapBuilder, Object, String> {
+
+}