Deprecate Alignment enum

Resolves #3778

Author: fmbenhassine

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/file/transform/Alignment.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006-2007 the original author or authors.
+ * Copyright 2006-2020 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.
@@ -19,8 +19,12 @@
 
 /**
  * @author Dave Syer
+ * @author Mahmoud Ben Hassine
  *
+ * @deprecated Use {@link FormatterLineAggregator#setFormat(java.lang.String)}
+ * for alignment (See examples in {@code FormatterLineAggregatorTests})
  */
+@Deprecated
 public enum Alignment {
 	CENTER("CENTER", "center"),
 	RIGHT("RIGHT", "right"),