Add getter for StreamsUncaughtExceptionHandler (#2144)

* Add getter for StreamsUncaughtExceptionHandler

StreamsBuilderFactoryBean needs a getter for StreamsUncaughtExceptionHandler.

* Addressing PR review

Author: sobychacko

spring-kafka/src/main/java/org/springframework/kafka/config/StreamsBuilderFactoryBean.java

@@ -199,6 +199,15 @@ public void setStreamsUncaughtExceptionHandler(StreamsUncaughtExceptionHandler s
 		this.streamsUncaughtExceptionHandler = streamsUncaughtExceptionHandler; // NOSONAR (sync)
 	}
 
+	/**
+	 * Retrieves the current {@link StreamsUncaughtExceptionHandler} set on this factory bean.
+	 * @return {@link StreamsUncaughtExceptionHandler}
+	 * @since 2.8.4
+	 */
+	public StreamsUncaughtExceptionHandler getStreamsUncaughtExceptionHandler() {
+		return this.streamsUncaughtExceptionHandler;
+	}
+
 	public void setStateRestoreListener(StateRestoreListener stateRestoreListener) {
 		this.stateRestoreListener = stateRestoreListener; // NOSONAR (sync)
 	}