DATAREDIS-1009 - Make StreamMessageListenerContainerOptions builder method public.

Builder method should be public to be usable from the calling code.

Original pull request: #465.

Author: Jacob O'Brien

src/main/java/org/springframework/data/redis/stream/StreamMessageListenerContainer.java

@@ -504,7 +504,7 @@ private StreamMessageListenerContainerOptions(Duration pollTimeout, @Nullable In
 		/**
 		 * @return a new builder for {@link StreamMessageListenerContainerOptions}.
 		 */
-		static StreamMessageListenerContainerOptionsBuilder<String, MapRecord<String, String, String>> builder() {
+		public static StreamMessageListenerContainerOptionsBuilder<String, MapRecord<String, String, String>> builder() {
 			return new StreamMessageListenerContainerOptionsBuilder<>().serializer(StringRedisSerializer.UTF_8);
 		}