Add step type in execution context of ChunkOrientedStep

Author: fmbenhassine

spring-batch-core/src/main/java/org/springframework/batch/core/step/item/ChunkOrientedStep.java

@@ -309,6 +309,7 @@ protected void close(ExecutionContext executionContext) throws Exception {
 
 	@Override
 	protected void doExecute(StepExecution stepExecution) throws Exception {
+        stepExecution.getExecutionContext().put(STEP_TYPE_KEY, this.getClass().getName());
 		while (this.chunkTracker.moreItems()) {
 			// check interruption policy before processing next chunk
 			try {