Add convenient StreamListenerContainer.getStreamName()

It would be nice to have `StreamListenerContainer.getStreamName()` method to fulfill need to dynamically stop/start listeners in reaction of broker events.

Let's say I need to react to RabbitMQ broker events of queue.created / queue.deleted and I need to start and stop listeners, which are assigned to these streams.
Currently I need to create an extra map of `listenerId` to `streamName` OR include `streamName` in `listenerId` (e.g. `listener:{streamName}`) to be able to carry our operations on listener.

A simple getter for `streamName` on the `StreamListenerContainer` would allow me to react to these changes dynamically without extra code effort.

Signed-off-by: David Horak <horak.david@protonmail.com>

[artem.bilan@broadcom.com: Fix JavaDoc for a new method. Fix Commit message]

Fixes: #2961

Signed-off-by: Artem Bilan <artem.bilan@broadcom.com>
# Conflicts:
#	spring-rabbit-stream/src/main/java/org/springframework/rabbit/stream/listener/StreamListenerContainer.java

Author: unbearables

spring-rabbit-stream/src/main/java/org/springframework/rabbit/stream/listener/StreamListenerContainer.java

@@ -56,6 +56,9 @@
  * @author Gary Russell
  * @author Christian Tzolov
  * @author Ngoc Nhan
+ * @author Artem Bilan
+ * @author David Horak
+ *
  * @since 2.4
  *
  */
@@ -111,6 +114,15 @@ public StreamListenerContainer(Environment environment, @Nullable Codec codec) {
 		this.streamConverter = new DefaultStreamMessageConverter(codec);
 	}
 
+	/**
+	 * Get a stream name this listener is subscribed to.
+	 * @return the stream name this listener is subscribed to.
+	 * @since 3.2.3
+	 */
+	public String getStreamName() {
+		return this.streamName;
+	}
+
 	/**
 	 * {@inheritDoc}
 	 * Mutually exclusive with {@link #superStream(String, String)}.