GH-325: Initial Support for RabbitMQ Stream Plugin

Resolves https://github.com/spring-cloud/spring-cloud-stream-binder-rabbit/issues/325

* Do not propagate `streamContext` header on output.

* Fix test broken by previous commit.

* Remove overrides from POMs.

docs/src/main/asciidoc/overview.adoc

@@ -164,6 +164,7 @@ Default: none - the broker will generate random consumer tags.
 containerType::
 Select the type of listener container to be used.
 See https://docs.spring.io/spring-amqp/reference/html/_reference.html#choose-container[Choosing a Container] in the Spring AMQP documentation for more information.
+Also see <<rabbitmq-stream>>.
 +
 Default: `simple`
 deadLetterQueueName::
@@ -413,6 +414,62 @@ Not supported when the `containerType` is `direct`.
 +
 Default: `1`.
 
+[[rabbitmq-stream]]
+=== Initial Support for the RabbitMQ Stream Plugin
+
+Basic support for the https://rabbitmq.com/stream.html[RabbitMQ Stream Plugin] is now provided.
+To enable this feature, you must add the `spring-rabbit-stream` jar to the class path - it must be the same version as `spring-amqp` and `spring-rabbit`.
+
+IMPORTANT: The consumer properties described above are not supported when you set the `containerType` property to `stream`; `concurrency` is also not supported at this time.
+Only a single stream queue can be consumed by each binding.
+
+To configure the binder to use `containerType=stream`, you must add an `Environment` `@Bean` and, optionally, a customizer to customize the listener container.
+
+====
+[source, java]
+----
+@Bean
+Environment streamEnv() {
+    return Environment.builder()
+            .build();
+}
+
+@Bean
+ListenerContainerCustomizer<MessageListenerContainer> customizer() {
+    return (cont, dest, group) -> {
+        StreamListenerContainer container = (StreamListenerContainer) cont;
+        container.setConsumerCustomizer(builder -> {
+            builder.offset(OffsetSpecification.first());
+        });
+        // ...
+    };
+}
+----
+====
+
+The stream name (for the purpose of offset tracking) is set to the binding `destination + '.' + group`.
+If you decide to use manual offset tracking, the `Context` is available as a message header:
+
+====
+[source, java]
+----
+int count;
+
+@Bean
+public Consumer<Message<?>> input() {
+    return msg -> {
+        System.out.println(msg);
+        if (++count % 1000 == 0) {
+            Context context = msg.getHeaders().get("rabbitmq_streamContext", Context.class);
+            context.consumer().store(context.offset());
+        }
+    };
+}
+----
+====
+
+Refer to the https://rabbitmq.github.io/rabbitmq-stream-java-client/stable/htmlsingle/[RabbitMQ Stream Java Client documentation] for information about configuring the environment and consumer builder.
+
 === Advanced Listener Container Configuration
 
 To set listener container properties that are not exposed as binder or binding properties, add a single bean of type `ListenerContainerCustomizer` to the application context.