This commit adds a new annotation `@EnableBatchIntegration` that makes
it possible to autowire two beans in the application context:
* RemoteChunkingMasterStepBuilderFactory: used to create a master step
* RemoteChunkingWorkerBuilder: used to create a worker integration flow
The goal of these new APIs is to simplify the setup of remote chunking
job by automatically configuring infrastructure beans.
Resolves BATCH-2686